Ratio and Proportion-1 | RRB NTPC

In 75 litres of mixture, milk and water are in the ratio 8 : 7. In order to change the ratio to 9 : 8. What is the quantity of water that must be added to the mixture?

The ratio of number of boys and girls in the school is 6 : 5. Certain number of new boys and same number of girls are admitted in the school and ratio changes to 8 : 7. If  the total number of students in the school was 2200, then what is the new number of students admitted?

If A : B = 4 : 5 and B : C = 7 : 6, then find the value of A : B : C?

Ajay got 82 marks in English and 76 marks in Mathematics while Vijay got 85 marks in English and 77 marks in Mathematics. If the maximum marks of each subject are 100, then what is the ratio of percentage of marks Ajay got to the percentage pf marks Vijay got?

If a : b : c : d = 5 : 7 : 9 : 11, then find the value of (3a + 5c) : (5b – 3d)?

A student has 50 notes comprising of ₹ 20 and ₹ 50.If the total sum he has is ₹ 1900, then what is the ratio of number of notes of ₹ 20 to the number of notes of ₹50?

The ratio of salaries of A : B is 8 : 7. If the salary of A is increased by 20% and salary of B decreased by 20%, then what is the ratio of new salaries of A and B??

Three numbers are in the ratio 2 : 3 : 4. If the sum of their cubes is 792, then find the average of the numbers?

Find the mean proportion of 64 and 16?

₹ 576 is divided between A and B in the ratio 7 : 9. What is the amount C will get, if it gets double the amount of what A got?