The answer to number 17 is 2 water bottles. First you have to figure out how much pounds you have left to 15, thats when you subtract 15- 13 3/8= 1 5/8
Next, you subtract 3/4 from 1 5/8. You are left with 1/8 after subtracting 3/4 from 1 5/8 2 times. You are left with 1/8. You can not subtract 3/4 anymore, in this case if add another matter bottle, it will exceed the limit of 15 pounds. Hope this helped.
