exam Maths Puzzle Numerical Ability

A woman is chosen at random among all women who have two children. She is asked if she has at least one son and answers yes. What is the probability that her other child is a boy?

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Thank You have 20 stampes that have a total value of $6.62. Some of the stamps are worth $0.24 each and others are worth $0.37 each. How many stamps of each type do you have? Please show how to solve this question.