If 10% of X is equal to 40% of Y, then the ratio between X and Y is :

2 years ago ratio of Sita and Prakash age was 5 : 8 respectively. After 4 years this ratio would become 2 : 3. Find the present age ( in years ) of Sita.

The two numbers whose mean proportion is 12 and the third proportional is 324, its value is?

If $(x+y) : (x-y) = 7 : 3$, then find the ratio of $(x^2+y^2) : (x^2-y^2)$.

There exist three numbers in the ratio of 3 : 2 : 7 such that the sum of their squares is equal to 558. The three numbers will be respectively:

If 30% of A = 0.25 of B = $\frac{1}{5}$ of C, then find A: B: C.

If $\sqrt{6} : x :: \sqrt{3} : (1 + \sqrt{2})$, then x is equal to