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

If the circumference of a circle is 3 meters than what is the diamiter and what is the radius? Find an equation of a hyperbola with vertices at (-9,4) and (-5,4) and asymptotes y=3x+25 and y=-3x-17.