exam Maths Puzzle Numerical Ability

I need help setting up an equation for the following question:

A 20L solution is 15% alcohol. How much water must be added to make it an 8% alcohol solution?

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exam Other Question

solve each of the following systems by sustitution.
8x-4y=16
y=2x-4
Solve the following for the variable Y
12xyt=36R