arithmetic

posted by .

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

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. maths- arithmetic

    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 thee women?
  2. Applied Calculus

    For the average person that is still growing, the rate of change in weight W (in pounds) with respect to height h (in inches) is approximately dW/dh=0.0015h^2 pounds per inch. Suppose that the average person that is 60 inches tall …
  3. Math - Averages

    Six dogs have an average(arithmetic mean) weight of 55 pounds. If the heaviest dog weighs 100 pounds, the lightest dog weighs 5 pounds, and the second-lightest dog weighs 30 pounds, what is the average weight of the other 3 dogs in …
  4. math

    the average weight of men in a meeting room is 170 pounds, and average weight of women is 130 pounds. if more than 60% of the people in the room are men, which of the following could be the average weight of all the people in the room?
  5. Statistics

    Explaining confidence. A student reads that a 95% confidence interval for the mean ideal weight given by adult American women is 140 ± 1.4 pounds. Asked to explain the meaning of this interval, the student says, “95% of all adult …
  6. statistics

    30 new babies were born yesterday in the hospital. If the average weight of a new born is 7.5 pounds with a standard deviation of 2.1 pounds, what is the probability of the average weight for these 30 newborns is between 7.2 and 7.6 …
  7. math

    The average weight of 6 eight graders is 150 pounds and the average weight of 4 7th graders is 120 pounds what is the average weight of the 10 students twostudents
  8. STAT

    The mean weight of all 20-year old women is 130 pounds. A random sample of 30 women athletes who are 20 years old showed a sample mean of 126 pounds with a standard deviation of 15 pounds. Researchers wanted to determine whether the …
  9. math

    Weights of women are normally distributed with mean 143 pounds and standard deviation 29 pounds. If 36 women are randomly selected, what is the probability that their mean weight is between 120 and 160 pounds?
  10. math

    Group A's average weight is 162 pounds .Group B's average weight is 156 pounds.There are twice as many people in group B AS IN group A.What is the over all average weight ?

More Similar Questions