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Maths Puzzle
Numerical Ability
A 50-gallon barrel of milk is 6% butterfat. How much skim milk (no butterfat) should be mixed to make milk that is 3% butterfat?
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book Other Question
Suppose you invest $12,000 in two funds paying 10.5 % and 13% simple interest. The total annual interest is $1447.50. How much is invested in each fund.
Please help.
simplify the rational expression
9x - 21
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15x - 35