exam Maths Puzzle Numerical Ability

2log2-log6

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ok, here we go.

John and Harry can paint a house in 10 days. when working alone John can paint the house in 30 days. How many days will it take Harry to paint the house.

I have no idea how to do this probolem. A woman buys 3 pairs of jeans for $99.84, including tax. If each pair of jeans cost $32, what was the sales tax?