exam Maths Puzzle Numerical Ability

Word Problem:

If John cleans a house in 8 hours and Julie cleans a similar house in 6 hours, how long should it take them to clean another similar house working together?

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exam Other Question
I need help with the following problem.

1/p+1 + 1/p-3 - 4/p2-2p-3 The surface areas of two cubes are in the ratio of 49:81. If the volume of the smaller cube is 20, what is the volume of the larger cube?