exam Maths Puzzle Numerical Ability

please help solve

find the product

( (5x+1)+6y) )^2

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exam Other Question

please help I am having trouble with this problem.

x + y = 4
-x +y =2 Sally paints a house in 4 hours, jill paints the same house in 6 hours, how long does it take them to paint the house together?