exam Maths Puzzle Numerical Ability

if it takes a person 50 seconds to travel one mile, what is his or her speed in mph?

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exam Other Question

Mary has $3.00 in nickels, dimes, and quarters. If she has twice as many dimes as quarters and five more nickels than dimes, how many coins of each type does she have? Im supposed to write each fraction as an equivalent fraction with the given denominator. Was doing good until they threw in letters. Can you help explain this process?

1/6 as ?/24x

Thanks