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arithmetic

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the average weight of 20 women is 130 pounds. if the average weight for 3/4 of these women was 140 pounds, what was the average weight, in pounds, for th rest of the women?

  • arithmetic - ,

    20*120=15*140 + 5*W

    solve for W

  • arithmetic - ,

    3/4 of the women is 20*3/4, or 15 women

    If the average of all of the women is 130lbs, then the total weight is 20*130 = 2600lbs

    The average of those 15 women is 140lbs. So 2600 - 15*140 is the weight left for the other 5 women.

    2600 - 15*140 = 500

    Find the average of those 5 women by dividing 500/5.
    500/5 = 100lbs

  • arithmetic - ,

    100

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