exam Maths Puzzle Numerical Ability

Simplify 4x [(7x2 + 2x - 5) + (3x2 + 9x)/3x

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exam Other Question

A hose can fill a swimming pool in 6 hours. Another hose needs 3 more hours to fill the pool than the two hoses combined. How long would it take the second hose to fill the pool? Solve. -3 (10x-3) + 10 (3x-3) = x-7