Question

Keith bought 7 new baseball trading cards to add to his collection. The next day his dog ate half of collection. There are now only 37 cards left . How many cards did Keith start with?

Answer 1

67

Explanation:

(X+7)/2 = 37

X = 67

Answer 2

Keith started with (prior to the 7 new cards) 67 baseball cards. However, if we're also counting the new ones, then 74 cards.

Explanation:

37*2=74

or x+7/2=37

x+7=74

-7 on both sides

x=67