Astack of 7 books weighs
9.1 pounds. if each book weighs the same amount, how much does each book weigh?

So you would do 9.1 divided by 7 and then get 1.3 which is your answer because each book weighs 1.3 pounds.You can then check that by doing 1.3 times 7 which equals 9.1.

Hope this helps!! :)