Alligation and Mixture Aptitude Test Paper 1

The Correct answer is (B)

Answer with explanation:

The mixture has 10% water, so the milk would be 90% of 60 liters.

Milk = * 60 = 54 liters
            100        

∴Water = 60 - 54 = 6 liters

Let water to be added = x liters

Now,   6+x  * 100 = 20
           60+x       

  6+x  =    1  
  60+x      5  

30 + 5x = 60+x

30 - 60 = x - 5x

- 30 = - 4x

x =30  =7.5 liters
      4     

The Correct answer is (A)

Answer with explanation:

In 114 parts of alloy, tin = 14 parts

∴Percentage of tin =  14  ∗100=12.3%
                              114        

The Correct answer is (C)

Answer with explanation:

Initially, the mixture contains 30% alcohol =  30 ∗20=6 liters of alchol
                                                                  100        

And, 70% of water =  70 ∗20=14 liters of water
                                100        

After adding 5 liters of water, the mixture contains (14+5) 19 liters of water and 6 liters of alcohol.

∴Percentage of alcohol = 6 ∗100=24%
                                    25

The Correct answer is (D)

Answer with explanation:

Apply alligation rule:

∴ Water ₌ 16 ₌ 1
    Milk     32    2 

Required ratio; water:milk = 1:2

The Correct answer is (C)

Answer with explanation:

Total cost price of (60+90)150 kg of mixture = (60*30+90*40)

                                                                        = 1800+3600

                                                                        = Rs. 5400

Cost Price per kg of mixture = 5400 ₌ Rs. 36 per kg
                                              150

Now, Required gain = 20%

∴Required selling price per kg of mixture = 120 ∗36 = Rs. 43.2 per kg
                                                                100