book Maths Puzzle Numerical Ability

Suppose a family of 5 kids. also suppose that the probability of having a girl is 50%. What is the probablity of having 2 girls and 1 boy

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Alex and Bobbie live 45 miles apart. They set out on their bikes riding towards each other along the same road. In 1 hour and 40 minutes they meet. It would take Alex 45 minutes please sketch 6 points, U, V, W, X, Y and Z on four lines such that each line contains 3 points. how many lines are concurrent at each point? Please hurry. thank you for your he