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

find the area of the rectangle with base of 12yd and height of 6ft let f(x)=x^3-1 and g(x)=x^2+x+1. find (f/g)(x)