exam Maths Puzzle Numerical Ability

How many rational numbers are there between 5 and 14?
Thank You!!

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exam Other Question

Linda has $1.85 in quarters, nickels, and dimes. If she has three times as many dimes as quarters, and five fewer nickels than dimes, how many of each coin does she have? I tried to use the sqrt property to solve the equation. The problem is x^2=9
Will you tell me if I did this correctly?
x^2=9
x=+/-9
x=+/-3
x=3, x=3
Thanks for anyones help.