Question

Jason bought 9 new baseball trading cards to add to his collection. The next day his dog ate half of his collection. There are now only 27 cards left. How many cards did Jason start with?

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Answer 1

47 cards

Explanation:

Suppose Jason starts with n cards. Then:

n + 9 before the dog ate half.

(1/2)(n + 9)= 27

Multiplying both sides by 2 clears the fraction:

n + 9 = 54, or n = 45

Jason started out with 45 cards.

Combin