exam Maths Puzzle Numerical Ability

Isolate the indicated variable for this formula. f=2.05(V2-V1)+3.75(V2-V1)for V2.

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exam Other Question

If Sally can paint a house in 4 hours, and John can paint the same house in 6 hours, how long will it take for both of them to paint the house together.
I know that Sally can paint a house 2/3 faster than John. 3x-4y=5
-4x+2y=6