Question 442883
Find the average of a group by adding all the values and dividing by the number of values. Since 3/4 of a group of 20 women is 15, there are fifteen with an average of 140 pounds, and the remaining five would have an average weight of x. Therefore, {{{130 = (15*140 + 5x)/20}}}. Solve by multiplying by 20 on both sides: {{{2600 = 15*140 + 5x}}}, then simplify {{{15*140}}}: {{{2600 = 2100 + 5x}}}, and subtract 2100 from both sides: {{{500 = 5x}}}, and divide both sides by 5: {{{100 = x}}}. Therefore, the average weight for the rest of the women is 100 pounds.