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Maths Puzzle
Numerical Ability
A roler has some $4/lb coffee and some $8/lb coffee that she will mix to make 50 lb of $5.60/lb coffee. How many pounds of each should be used?
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1. five divided by the difference of a number and 8 equals the quotient of 10 and then sum of the number and 12. find the number.
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graph f(x) = -2x + 2