A circular ground of radius  7 m is surrounded by a path of width 3.5 m. Find the area of path.

A train 400 m long passes a pole in 20 seconds. What is the speed of the train?

Three pots contain equal mixture of milk and water in the ratio of 4: 1, 5: 2 and 6: 1 respectively. If all the solutions are mixed together. What is the ratio of milk and water in the final solution?

If $${4x^2={15^2-9^2}}$$ then the value of x is

A trader sells two items at the rate of Rs 400 each. If he gains 15% on one and losses 15% on other, then what is the value (in Rs) of loss?

∆ DEF is right angle at E. if m∠F = 30⁰ Then Find the value of   $$\left( cos D - {1\over 2}\right)$$ = ?

Some persons can do a piece of work in 12 days. Two times the number of such persons will do half of the work in 

The smallest positive integer when multiplied by 392, the product is a perfect square, is