exam Maths Puzzle Numerical Ability

Factor 5 x 2 + 5 x y + 13 x + 13 y by grouping.

answer: (5y + 13x)(x - y)

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exam Other Question

cant figure this out (5x+y)/a=2,for a A certain real-estate agent receives $6 for every &100 of a houses selling price. How much was the house sold for if the agent receives $10,725?