The ratio between the boys and girls in a class is 6:5 respectively. If 8 more boys join the class and two girls leave the class then the respective ratio become 11:7. What is the number of boys in the class now?

A and B have money in the ratio 2: 1. If A gives Rs. 2 to B, The money will be in the ratio 1: 1. What were the initial amounts they had? 

If a : b = 7 : 9 and b : c = 5 : 7, then what is a : c ?

If ( 2x – y): ( 5x+3y)=3 : 8 then ( x² + y²) : ( x² – y²)=?

What must be added to two numbers that are in the ratio of 3:4, so that they become in the ratio 4:5?

A sum is divided among 120 men and some women in the ratio 15:21. If each man gets Rs. 5 and each woman gets Rs. 4, the number of women is

If   0.8 : X :: 5 : 8, then the value of X is

If X: Y = 4: 3 and Y: Z = 5: 3. If X+Y+Z = 1584. Find X?