f Sally can paint a house in 4 hours, and John can paint the same house in 6 hour, how long will it take for?

sally and john to paint the same house together. I got a correct answer of 1/6 and 1/4, but how did you get the 10/24 out of that?

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  • 1 decade ago
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    Sally can paint 1/4th of the house in an hour.

    John can paint 1/6th of the house in an hour.

    You find the lowest common denominator (12) and multiply the numerator for each person to get to that denominator.

    For instance, Sally can paint 3/12th of a house in an hour.

    John can paint 2/12th of a house. After 1 hour together, they would have painted 5/12th of the house, or 10/24th.

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