exam Maths Puzzle Numerical Ability

I am trying to help my son to figure out how to set up and solve the following types of problems:

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4. 15 is what percent of 60

5. 30 is 60% of what number

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Can someone help me with this equation?

Jill budgets 1/5 of her yearly salary for clothing. Jills total clothing bill for the year is $8,000. What is her yearly salary?

Thanks in advance for your help! Find the first and third quartiles,Q1 and Q3, of the following set of numbers.

13,5,12,16,7,14,7,3,10,7

a) 7;13
b) 3;16
c) 5;12
d) 5;14

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