exam Maths Puzzle Numerical Ability

Find the mean?
5, 6, 9, 11, 14

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exam Other Question

solve the system of equations using the echelon method.
5x-3y=-1
2x-7y=17
Write the ratio of 7 nickels to 2 quarters in simplest form.

I think it would be 7/2. Am I right? Please confirm.