exam Maths Puzzle Numerical Ability

express the solution in exact form

ln(-x)+ ln 3=ln(3x-9)

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exam Other Question

Remove the paranthesis.
-(3x+5y) A dairy has 50 Gallons of milk that is 7.8 % butterfat. how much skim milk (no butterfat) should be mixed with it to make milk that is 2% butterfat?