exam Maths Puzzle Numerical Ability

2x+y=16
3x-y=4
I need to solve for x and y

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exam Other Question

76. Darren and Douglas must paint the 792 foot fence that encircles their family home. Because Darren is older, he has agreed to paint 20% more than Douglas. How much of the fence will each boy paint? Find CGF - Factor Out, Pease help
15x^2y^2-9xy^2+6x^2y
Thank you