# Ratio and Proportion with Explanation

Q8. 20 litres of the mixture has water and milk in the ratio 3 : 5. If 4 litres of the mixture is to be replaced by 4 litres of milk, then what is the ratio of water to milk in the new mixture?

 A. 7 : 3 B. 3 : 7 C. 4 : 7 D. 8 : 3

Q9. In a school, there are 200 girls and the ratio of the number of girls to boys is 4 : 9. Then how many students are there in the school?

 A. 620 B. 700 C. 650 D. 600

Q10. An amount of Rs. 366 is to be divided among P, Q, and R in such a manner that Q gets two-third as much as P and R together, and P may get half as much as Q and R together. What is the share of P?

 A. 130.60 B. 122 C. 173 D. 146.60

Q11. Seats for Computer Science, Mechanical, and Electronics in a university are in the ratio 7 : 5 : 8. There is a planning to increase these seats by 50%, 40%, and 75% respectively. Find the ratio of increased seats?

 A. 6 : 7 : 8 B. 8 : 6 : 9 C. 3 : 4 : 5 D. 3 : 2 : 4

Q12. An alloy contains iron and nickel in the ratio 8 : 3. Find the quantity of iron required to be melted with 21 kg of nickel?

 A. 65 kg B. 60 kg C. 56 kg D. 83 kg

Q13. Divide Rs. 1328 among three boys Suresh, Ramesh, and Ganesh in the ratio 34 : 26 : 23. The sum of Suresh and Ganesh share is

 A. Rs. 912 B. Rs. 965 C. Rs. 821 D. Rs. 756

Q14. A Father has 735 toffees and wants to distribute among his 3 children A, B, and C. If each child had received 25 less toffees, their shares would have been in the ratio 1 : 3 : 2. The number of toffees received by C is

 A. 230 B. 225 C. 200 D. 250