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?"

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aquabhavu

  • Aug 20th, 2007
 

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

suyognaik

  • Oct 29th, 2008
 

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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