exam Maths Puzzle Numerical Ability

Simplify

M4power(N -3power)2power/(M -2power)-3power/(M-4power N 8power/N 8power M -2power)2nd power

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exam Other Question

Fat Chance can row his boat 9 miles up Moss Creek in the same time that it takes him to row 15 miles down the creek. If fat can row 2 miles per hour in still water, how fast is the current in Moss Creek? what if its x=y+1
x+2=6

or 3x-y=2
y=2x-9