exam Maths Puzzle Numerical Ability

How Do i Solve THe following Equation?
Translate to a system of equations and solve.
A collection of nickels and dimes totals $22.40. There are
304 coins in all. How many nickels are there.

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exam Other Question

gym is 21 years newer than the auditorium. the gym is also one fourth as old as the auditorium. how old is each building? choices for auditorium age: 26, 27, 28

write and equation to
solve (x+10)(x-4)(x+6)>0