Question

Mike sold half of his comic books and then brought 9 more. He now has 13. How many did he begin with?

Answer 1

Comics he now have = 13

Comic he had before buying 9 comics

$= 13 - 9 \\ = 4$

Comic he initially had

$= 4 \times 4 \\ = 16$

(As he sold half of his comics before buying 9 comics)

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