The average age of M1, M2 and M3 ,3 years ago was 27 years and that of M2 and the M3 ,5 years ago was 20 years. The present age of the M1 is:

What will be the greatest number of four digits which is divisible by 15, 25, 40 and 75?

Find the value of Sec²77⁰-Cosec²75⁰C-tan²77⁰+Cot²75⁰

A Gallon contains 40 litres of milk. From this Gallon 4 litres of milk was taken out and replaced by water. This process was repeated further two times. How much milk is now contained by the gallon?

Pinki and Prakash can together finish a work in 30 days. They worked together for 20 days and then Prakash left. After another 20 days, Pinki finished the remaining work. In how many days Pinki alone can finish the work?

Priyanka invested an amount of Rs. 25000 in a fixed deposit scheme for four years at compound interest rate 20 percent per annum. How much amount will Priyanka get on maturity of the fixed deposit?

A Cistern is filled by three pipes with uniform flow. The first two pipes operating simultaneously fill the tank in the same time during which the tank is filled by the third pipe alone. The second pipe fills the tank 5 hours faster than the first pipe and 4 hours slower than the third pipe. The time required by the first pipe is:

What is the unit digit of 7²⁰⁰⁵ + 7²⁰⁰⁶/ 7²⁰⁰⁵ + 7²⁰⁰⁶  

If  sides of a rectangle is increased by 20% then the percentage increase in the area of a rectangle will be ?

There are coins of 25 p, 10 p and 5 p in the ratio of 1 : 2 : 3 in a closed bag. If there is Rs. 30 in all, how many 10 p coins are there?