Arithmetic - how to calculate the answer to "the average weight for a group of 20 women is 130 pounds. If the ave

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how to calculate the answer to "the average weight for a group 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 the rest of the women?"

Total Answers and Comments: 6

Last Update: February 01, 2009 Asked by: Lakisha

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Best Rated Answer

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Submitted by: aquabhavu

Answer is 100

Steps to reach answer

Weight of 20 women is 20*130=2600
Weight of 15(3/4) women is 15*140=2100
Weight of 5(1/4) women is (2600-2100)=500

then avg of 1/4 is 500/5: 100

Above answer was rated as good by the following members:
stella61, madhuridatta

August 20, 2007 17:22:32

aquabhavu

Member Since: August 2007 Contribution: 1

RE: how to calculate the answer to "the average weight...

Answer is 100

Steps to reach answer

Weight of 20 women is 20*130 2600
Weight of 15(3/4) women is 15*140 2100
Weight of 5(1/4) women is (2600-2100) 500

then avg of 1/4 is 500/5: 100

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June 05, 2008 23:51:45

sandy.sagi

Member Since: June 2008 Contribution: 1

RE: how to calculate the answer to "the average weight for a group 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 the rest of the women?"

100 pounds

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June 16, 2008 13:43:33

praisyjones

Member Since: June 2008 Contribution: 1

five hundred

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June 17, 2008 21:34:50

mechterror

Member Since: June 2008 Contribution: 2

hundred

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October 29, 2008 06:58:25

suyognaik

Member Since: October 2008 Contribution: 1

The Answer is 100.

Let us assume tht the Total wt is "x"
The avg of x/20 130.
x 20*140
x 2600

Since 3/4 of 20 15

therefore Avg of y/15 140.
y 140*15
y 2100

Now Let the total wt of remaining women be z
z 20-15
z 5.

So The Total wt of 5 women 2600-2100 500.
Therefore the average wt is 100.

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February 01, 2009 16:49:07

shreekanthss

Member Since: February 2009 Contribution: 9

Answer is 100 steps
Weight of 4 women 4*130 520
Weight of 3/4 women 3*140 420
So the weight of the rest of the women will be 520-420 100

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