He pays 5*5=$<<5*5=25>>25 for buying crayons.
He pays 10*5=$<<10*5=50>>50 for buying books.
He pays 3*5=$<<3*5=15>>15 for buying calculators.
The change he has for buying bags is 200-25-50-15=$<<200-25-50-15=110>>110.
The number of bags he can buy is 110/10=<<110/10=11>>11 bags.
#### 11