In a 400 ml mixture of water and milk the quantity of water is 70%. How much milk must be added to the mixture so that the quantities of milk and water in the mixture become equal?

Fresh fruits contain 70% water in them whereas dry fruits contain 25% water. Find the quantity of dry fruits that can be obtained from 100 kg fresh fruits.

A sum of money lent at compound interest for 2 years at 20% per annum would fetch Rs. 482 more, if the interest was payable half-yearly rather than annually. The sum is

A sells an article to B for Rs. 45000 at a loss of 10% in the transaction. B sells it to C at a price which gives a profit of 10% to A. By what per cent does B gain?

A man can row against a current three-fourths of a kilometre in 15 minutes and returns the same distance in 10 minutes. The ratio of his speed to that of the current is