Question

mike bought four new baseball cards to add to his collection the next day his dog ate half of the collection. there are twenty -nine cards left. How many did he start with?

Answer 1

Since the dog ate half of the collection, and 29 remained, we deduce that twice the value of remaining cards must be the value of the total collection with the 4 new cards. Simply multiply 29 by 2 and subtract four from the previous result and this is the answer.

29*2= 58

58 - 4 = 54

Answer: He started with 54 cards.