Homework Help Forum: arithmetic

Posted by Anonymous on Thursday, August 6, 2009 at 1:41pm.

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 - bobpursley, Thursday, August 6, 2009 at 1:56pm

  20*120=15*140 + 5*W solve for W

  
  

• arithmetic - Marth, Thursday, August 6, 2009 at 1:57pm

  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 - Rachael, Sunday, November 1, 2009 at 8:44am

  100

  
  

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