HELP:::Eric has been donating books he no longer needs to his local library. After 3 months of donating, he had 157 books left in his room. After 8 months of donating, he had 102 books left in his room. How many books per month did Eric donate on average between months 3 and 8?
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After three months of donating he had _____ books left.
After eight months of donating he had _____ books left.
so, how many did he donate between the 3rd month and the 8th month?
I made an error earlier.
\((8−3)x=(Books~ at~ 3~ months)−(Books~ at~ 8~ months)\)
Correct, so we have 5x=....
No, slow down.
Left side of the equation is 5x.
5x=(Books at 3 months)−(Books at 8 months)
look at it this way
you have some books you don't want from an older grade
so you go to the local Good Will store and givem away a few every month
on the 3rd month of donating, you still had left 157 books you didn't want
5 months later, after donating every month regularly, you only have left 102
how many have you donated in between the 3rd month and the last month?