Question 3 - Answer

This question we have to work backward.


Step 1 : Michael : 126 = 3 units 42 = 1 unit (give Shawn)

                            126 + 42 = 168

Step 2 : Shawn : 126 – 42 = 84 = 3 units 28 = 1 unit ( give Michael)

                          84 + 28 = 112 ( initial stamps)

Step 3 : Michael : 168 – 28 = 140 ( initial stamps)

Shawn had 112 stamps at first.