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MathematicsMathematics
26 January, 16:50

David and Fiona have a house painting business. Fiona can paint a house in 3 days, David can paint the same house in 4. How quickly could they paint it together?

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  1. 26 January, 19:26
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    3.5 days!

    Just because they work together, it doesn't mean they'll work twice as fast!

    Find the average of the two by adding 3 and 4 to get 7 and then divide by 2 to get 3 and a half hour.

    I think. xD This is kind of tricky.
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