A man sold a book at a profit of 25 percent of S.P. The percentage of profit on his cost price of the book is ________.

The salary of a school teacher was increased by 25% and later it was decreased by 25%. If he now draws ₹937.50, what was the original salary?

The average age of 10 men is increased by 2 years when one of them, who is 25 years of age, is replaced by a new man. What is the age of the new man?

If 12 1/2 % of a certain number is 32, what is 40% of that number?

Anita invested ₹8000 at 7 1/2 percent per annum for 2 years and 4 months. How much interest did she get at the end of the period?

Find the L.C.M. of 2, 3, 5, 6, 12, 60.

In how many minimum number of complete years will a sum of money put out at 25 percent compound interest be more than doubled?

Find the greatest number that will divide 2934 and 3250 and will leave a remainder of 11 in each case.

A train of length x metres passes a man standing on the platform in 7 seconds. If the speed of the train is 72 km an hour, find x.