book Maths Puzzle Numerical Ability

If Sally can paint a house in 4 hours, and John can paint the same house in 6 hours, how long will it take for both of them to paint the house together?

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This is a lever problem I spent an hour trying to figure out last night. I will be so grateful for an explanation.

A woman uses a 10-foot bar to lift a 210-pound stone. If she How would you factor x^2 + 10x + 8. It is part of a larger problem I am having alot of trouble with