exam Maths Puzzle Numerical Ability

David has collected $6.50 in nickels and dimes. If she has 75 coins, how many of each coin does she have?

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exam Other Question

Suppose that Math 103 scores are normally distributed and they have a mean of 80 and a standard deviation of 6.
A) Find the Math 103 Score two standard deviations above the mean.
B)What percent of all scores is greater than 92? Six pears and three apples cost $3.90. Two pears and five apples cost $3.30. How much does one pear cost?