Question

. Amelio decided to give away most of his baseball

cards. He gave 15 to his best friend, and then gave
half of what he had left to his brother. After that, he
gave his cousin 10 cards, and he kept the remaining
12 for himself. How many cards did he start with?

Answer 1

Explanation:

Let x be the original number.

x - 15 - 1/2(x - 15) - 10 = 12

x - 15 - 1/2 x + 7.5 - 10 = 12

1/2x - 25 + 7.5 = 12

1/2x - 17.5 = 12

1/2x = 27.5

x = 55