A person purchases tomatoes from each of the 4 places at the rate of 1kg., 2kg., 3kg., and 4kg. per rupee respectively. On the average, how many kilograms has he purchased per rupee?

A family has two children. What is the probability that both the children are girls given that at least one of them is a girl?

From a pack of 52 cards, two cards are drawn at random. Find the probability that one is a king and the other is a queen.

Let P(A) = \(\frac{3}{5}\) and P(B) = \(\frac{1}{5}\) . Find P(A∩B) if A and B are independent events.

An investor buys Rs. 1,500 worth of shares in a company each month. During the first four months he bought the shares at a price of Rs. 10, 15, 20 and 30 per share. What is the average price paid for the shares bought during these four months? Verify your result.