exam Maths Puzzle Numerical Ability

How many gallons of a 4% acid solution should be mixed with 20 gallons of a 10% acid solution to obtain a mixture that is 5% acid?

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exam Other Question

Remove the parentheses by applying the Distributive Property. 20x(3-2x) I am having trouble with my homework sheets on matrices. Could someone please help with these.
Write the matrix equation as a system of equations and solve the system.
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