View Full Version : Math brain teaser
Umm_Maysa
12312005, 08:50 PM
:sl:
Ahmad is writing a book. He starts on page 1. When he finished, he uses a total of 228 digits.How many pages does he have?
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s_123_v
12312005, 09:02 PM
is it 228
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Umm_Maysa
12312005, 09:18 PM
:sl:
Nope. try again . Read carefully . It says 228 digits not 228 pages.
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muslimahh
12312005, 10:59 PM
184?? :d
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muslimahh
12312005, 11:10 PM
format_quote Originally Posted by
muslimahh
184?? :d
WAIT! hehe 121!!
b.c. 9 (for page 19) = 9 pages
PLUS 90 pages (to total 99) x2 (180)
so thats 180+ 9 digits, i.e. 189 digits (we have 100 pages so far here)
then 228  189 = 39
39 divided by 3 (for the 3 digit numbers (100 onwards) = 13
so 9 pages + 99 pages +13 pages = 121 pages!!!
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muslimahh
12312005, 11:12 PM
ergh sorry (no post editing, sorry for the million posts...trying to work this out :)
9 + 90 (not 99 whoops) + 13 = 112!!! :D
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sapphire
12312005, 11:46 PM
i got 106
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afriend
12312005, 11:58 PM
Good 1 but i'm terible at maths....so u can't really expect the answer from me.
Is it 28?
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Mainul_Islam
01012006, 01:15 AM
format_quote Originally Posted by
muslimahh
WAIT! hehe 121!!
b.c. 9 (for page 19) = 9 pages
PLUS 90 pages (to total 99) x2 (180)
so thats 180+ 9 digits, i.e. 189 digits (we have 100 pages so far here)
then 228  189 = 39
39 divided by 3 (for the 3 digit numbers (100 onwards) = 13
so 9 pages + 99 pages +13 pages = 121 pages!!!
is THAT ([MOUSE]^^[/MOUSE]) suppose to be the brain teaser?! :\ i dont understand a single thing u did!
lets see.. if he has 228 digits of pages.. then his # of pages is in the 100 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000th number :confused: Reply
Malaikah
01012006, 01:18 AM
salam
when the question says digits, exaclty what is it refering to??
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Umm_Maysa
01012006, 03:14 AM
:sl:
Sister Muslimahh got it right masha Allah.. digits means the unit example 100 means 3 digit, so pages 100105 means 3 x 6=18 digits
100, 101, 102,103,104,105
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nurah19
01012006, 04:38 AM
asslamu alaikum i still don't get it where did u find this problem, never mind i am a history major not math
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Mainul_Islam
01012006, 04:45 AM
wow... im impressed... some brains u got there!
*claps*
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muslimahh
01012006, 05:08 AM
hehe Alahdulillahi RabbAlAlameen,
JazakAllah bro Mainul_Islam,
Simple logic alhamdulillah...I actually failed math like crazy in high school hehe, steered clear of it in undergrad....I thought it was ironic I actually got it right heheh,
JazakAllah Khayr maysa for the brain teaser!! :D got anymore?? :)
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*shamz*
01012006, 07:23 PM
format_quote Originally Posted by
muslimahh
ergh sorry (no post editing, sorry for the million posts...trying to work this out :)
9 + 90 (not 99 whoops) + 13 = 112!!! :D
u are soooo clever im lost
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sapphire
01012006, 10:55 PM
hmmmmmmmm........ok i lost 6 along the way i guess..........
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Mainul_Islam
01022006, 03:10 AM
format_quote Originally Posted by
zAk
i got 112 straight away ! :\
:shade:
but u didnt say anything so too bad :p Reply
hissa
01022006, 05:36 AM
:sl:
All this math hurts my brain... :confused:
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Mainul_Islam
01022006, 07:21 AM
format_quote Originally Posted by
hissa
:sl:
All this math hurts my brain... :confused:
too....much....to...handle!!!! :?
my head is gonna explode!!! AAAHHH!!! :enough!:
BOOM! :exhausted Reply
Umm Safiya
01022006, 09:10 AM
:sl:
I don't get it! :?
:w:
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Umm_Maysa
01032006, 03:20 AM
:sl:
Anyone has question related to this topic?? Don't have to wait only from me. We may share in here.Anyone????
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shudnt_have
01032006, 03:51 AM
:sl:
I will start off with an easy question; inshallah.
2x + 3y = 19 and 6x  3y = 21. Find x and y.
:w:
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shudnt_have
01032006, 04:09 AM
if this is too easy then here is one I have for ya..
Laila has 17 members in her family. Samira has 10 members. Laila’s 4 of the “members” are same as Samira’s. How many members would be in the annual reunion of both of these families?
:sl:
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Umm_Maysa
01032006, 04:23 AM
format_quote Originally Posted by
shudnt_have
:sl:
I will start off with an easy question; inshallah.
2x + 3y = 19 and 6x  3y = 21. Find x and y.
:w:
:sl:
2x + 3y = 19....(a)
6x  3y = 21....(b)
(a)+(b) => 8x = 40
x= 5
then y =3
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Umm_Maysa
01032006, 04:26 AM
format_quote Originally Posted by
shudnt_have
if this is too easy then here is one I have for ya..
Laila has 17 members in her family. Samira has 10 members. Laila’s 4 of the “members” are same as Samira’s. How many members would be in the annual reunion of both of these families?
:sl:
What do u mean by same? same age same numbers???
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shudnt_have
01032006, 04:35 AM
format_quote Originally Posted by
maysa
What do u mean by same? same age same numbers???
same numbers...
btw, mashallah the last one was correct:rose:
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shudnt_have
01032006, 05:22 AM
:sl:
Lol, Mashallah Correct..now its your turn.:sister:
:w:
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Umm_Maysa
01042006, 10:02 PM
:sl:
I will give it a try
Let's say a=b
then multiply both side with a
a*a=a*b
a²=ab
then subtract with b²
a²b²=abb²
factor both side
(a+b)(ab)=b(ab)
cancel both same
a+b=b
since a=b then
b+b=b
so 1b' +1b"=1b''' ...the ' denote the position of the b
so 1b"=1b'''1b'
1b=0b
1=0 proved#
so
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Mainul_Islam
01052006, 04:17 AM
lol nice... ;D
are u a mathematician or something??
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Umm_Maysa
01052006, 08:37 AM
:sl:
I don't do copy paste , but I know this problem..but Zak is real mathematician
I can't get a=b=1 which I think much quicker and shorter way...Anyway maths always my favourite subject but I am not mathematician...
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Umm_Maysa
01052006, 09:01 PM
:sl:
this not math I think..
Abdullah and his 7 friends (8 persons all together) went to the restaurant. He ordered the pizza. The owner of restaurant said if u can cut this pizza only by 3 cut for eight persons I will give another free pizza. Abdullah then cut the pizza and they receive another free pizza. How would he do it??
(eg: if u cut the pizza like the cross means u have made 2 cutone horizontal one vertical)
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Mainul_Islam
01052006, 09:39 PM
cut the pizza 120 degrees for each point from the center. :?
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sapphire
01052006, 09:45 PM
^^yup thats what i was going to say.......otherwise i dont under stand the question......
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Umm_Maysa
01052006, 09:50 PM
:sl:
That's 3 cut right but it is only for 3 person while u are 8...
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sapphire
01052006, 09:52 PM
making three cuts but we end up with eight slices is that the question??
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Umm_Maysa
01052006, 09:56 PM
format_quote Originally Posted by
sapphire
making three cuts but we end up with eight slices is that the question??
Yess definitely
Since nobody answered so I give the answer...Imagine a pizza..it is round right..then u make another round inside the pizza not to close to the edges(1 cut) and make a cross(means 2 cut).so u have 8 pieces...
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