exam Maths Puzzle Numerical Ability

square root of x - 1 = x - 7

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exam Other Question

i'm not sure how the book got this answer the equation is (3x-2y3)-2(4x3y-4). i got the answer as 36x7y-10 but the book got 4x7/9y10 It takes Tom 2 days to paint a house and it takes Leah 4 days and it takes Lisa 6 days. How long will it take to paint the house together?
Please explain how to set up this solution