The average weight for a group of 20 women is 130 lbs. Theaverage weight for thr

Question

The average weight for a group of 20 women is 130 lbs. Theaverage weight for three fourths of these women is 140 lbs. What isthe average weight in lbs of the rest of the women? The solution is 100 lbs, but I do not understand how to workout the problem. The average weight for a group of 20 women is 130 lbs. Theaverage weight for three fourths of these women is 140 lbs. What isthe average weight in lbs of the rest of the women? The solution is 100 lbs, but I do not understand how to workout the problem.

Explanation / Answer

Hi! So we know the average weight of the 20 women is 130 lbs. Thatmeans that together the women weight 20 * 130 = 2600 lbs. If the average for 3/4 is 140 lbs then that means theaverage for 15 of the women is 140. So together they weigh2100. So since all 20 women weigh 2600 the 5 remaining women mustweight 2600 - 2100 = 500 altogether the average of 500 over 5 women is 100 lbs! Hope that helps!

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