One hundred times of 100 is how many times of 500 ?

If 3/4 of a number’s 1/3 part’s 4/5th part is 80, what is the number?

The diameter of two spheres are in the ratio 1 : 2. What is the ratio between their volumes ?

8 % of a number is 216. ,What is the number?

50 % of 50 % of16 is:

If A : B = 3 : 2 ; B : C = 4 : 5, what is A : B : C ?