exam Maths Puzzle Numerical Ability

-52=52 + k

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Determine the value of m and b by rewriting the linear equation 12 = 8x + 2y in the form y = mx +b Working together Linda and Jim can clean the windows of their house in 3 hours and 36 minutes. Linda can clean all the windows by herself in 7 hours. How long will it take Jim to clean the windows by himself?