exam Maths Puzzle Numerical Ability

Could you please help me with this problem. I am supposed to use a system of equations to solve this question.
I have 30 coins worth $6.00. The coins are quarters and dimes. How many of each do I have?
Thank you very much!

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exam Other Question

Given: y = f(x) = (x - 2) / x + 3) find the RANGE and DOMAIN and the VERTICAL and HORIZONTAL ASYMPTOTES. How much water must be evaporated from 38 ounces of a 4% salt solution to make a 5% salt solution?

I have to "let x = something"
and then set up an equation and solve it.