book Maths Puzzle Numerical Ability

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

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a coin collection contains nickels, dimes, quarters and pennies. the face value of the pennies was $8. there were seven more than three times as many quarters as dimes and sixteen 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