book Maths Puzzle Numerical Ability

i need help with like-terms. here is one of my problems......

(6v^5-5v)-5(7v^5-2v-7)

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book Other Question

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? what is the cubed root of 54x^8