book Maths Puzzle Numerical Ability

(x-6)(x-1)
(x2+4x+3)(x-6)

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book Other Question

Please help me to perform indicated operation and simplify if possible:

5x over x^2-9 minus 4 over 3-x 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?