Ratio and proportion aptitude questions
2.  Two numbers are respectively 20% and 50% more than a third number. The ratio of the two numbers is:  
Answer: Option C Explanation:
Let the third number be x.

3.  A sum of money is to be distributed among A, B, C, D in the proportion of 5 : 2 : 4 : 3. If C gets Rs. 1000 more than D, what is B’s share?  
Answer: Option C Explanation:
Let the shares of A, B, C and D be Rs. 5x, Rs. 2x, Rs. 4x and Rs. 3x respectively. Then, 4x – 3x = 1000 x = 1000. B’s share = Rs. 2x = Rs. (2 x 1000) = Rs. 2000. 
4.  Seats for Mathematics, Physics and Biology in a school are in the ratio 5 : 7 : 8. There is a proposal to increase these seats by 40%, 50% and 75% respectively. What will be the ratio of increased seats?  
Answer: Option A Explanation:
Originally, let the number of seats for Mathematics, Physics and Biology be 5x, 7x and 8x respectively. Number of increased seats are (140% of 5x), (150% of 7x) and (175% of 8x).
14x : 21x : 28x 2 : 3 : 4. 
5.  In a mixture 60 litres, the ratio of milk and water 2 : 1. If the this ratio is to be 1 : 2, then the quanity of water to be further added is:  
Answer: Option D Explanation:
Quantity of water in it = (60 40) litres = 20 litres. New ratio = 1 : 2 Let quantity of water to be added further be x litres.
20 + x = 80 x = 60. Quantity of water to be added = 60 litres. 