Question

162 water bottles in 9 cases

Answer 1

Your answer is 18 because your dividing

Answer 2

Your answer is 18 but do you know who you would get that well you would do 9/162 9x? gets you close to 16. the answer for that is 1 so 9x1=9 so 16-9=7 
   _72 so 9x? get you close to 72. the answer for that is 8 so 9x8=72 so                72      72-72=0
       0