exam Maths Puzzle Numerical Ability

How many gallons of a 25% acid solution must be mixed with 100 gallons of a 6% acid solution to obtain a solution that is 20% acid?

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exam Other Question

Write the equation of the line that passes through point (-1, 11) with a slope of -5. How do i get the answer as well as show my work on this question. 3x-4y^2+9
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