kiki: there are 90 pens in 5 boxes we need 216 more pens how many boxes will we order
Ok, you have 90pens / 5 boxes. 90/5 = 18pens per boxes.
So, if you have 216 mores pens, how can you know how many boxes you'll need?
I'll start you. 216/___=numbers of boxes
Give a try, and if you don't know how to get the answer, I'll help you a little more.
+142 
