book 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

A swimming pool can be filled in 6 h and requires 9 h to drain. If the drain was accidentally left open for 6 h while the pool was being filled, how long did filling the pool require? solve for T please
BT^2=F^3/Z
if B=2
F=3
Z=4