book Maths Puzzle Numerical Ability

Thankx Pieter!

What are the next two terms of the sequence 32, -48, 72, -108, . . . ?

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book Other Question

solve: 2x-4=-14 Milk that has 5% butterfat is mixed with milk that has 2% butterfat. How much of each is needed to obtain 60 gallons of milk that has 3% butterfat? I am horrible at understanding