exam Maths Puzzle Numerical Ability

Solve for x: a/(x-3a)=b/(x+3b)

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exam Other Question

The arm of a car windshield wiper is 32.4 cm long and is attached at the middle of a 38.1 cm blade.(Assume that the arm and blade are in line.)What area of the windshield is cleane will someone please answer this question: what is the standard form of x=2/7+y? i have looked everywhere for what standard form is and i am not getting anywhere! thank you