Ram has 5 daughters. The average age of these 5 sisters is 28 years. The youngest one is 16 years old. What was the average age of the 4 daughters before the youngest one was born?

At present, the sum of the ages of A, B and C is 150 years, whereas 10 years ago, the ratio of their age was 5 : 4 : 3. Find the ratio of their ages after 10 years.

The simple interest on an amount at the rate of 7 percent for five years is Rs 700. So how much is the principal?

if a=26 and b=22, then the value of   $${{a^3-b^3}\over {a^2-b^2}}-{3ab\over a+b}$$ is

In △ABC, right angle at B, if   $$tan\ A={1\over 2}$$, then the value of $$sinA(cosC+cosA)\over cosC(sin C-sinA)$$ is :

A bullet travels at 750 m/s. How long will it take to travel 1 km?

For a sample data, mean = 60 and median = 48. For this distribution, the mode is:

What should come in place of the question mark '?' in the following number series?

0.25, 1.25, 4.5, ?, 70, 355