exam Maths Puzzle Numerical Ability

Factor out the greatest common factor GCF
12x5</sup>y3</sup> + 8x3</sup>y2</sup> - 28x2</sup>y4</sup></PRE>

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exam Other Question

3^/x - 5 = 3........... 3 cuberoot over x - 5 = 3

posted my question incorrectly

Thanks Cleaning Sidewalks. Edgar can blow the leaves off the sidewalks around the capitol building in 2 hours using a gasoline-powered blower. Ellen can do the same job in 8 hours using a broom. How long would it take them working together?