Respuesta :
I am assuming she carries her lunch in her backpack...
1 + 3b = 18
3b = 18 - 1
3b = 17
b = 17/3
b = 5 2/3......so she can carry 5 books...if she didn't carry her lunch, she could carry 6 books..lol
1 + 3b = 18
3b = 18 - 1
3b = 17
b = 17/3
b = 5 2/3......so she can carry 5 books...if she didn't carry her lunch, she could carry 6 books..lol