On Tuesday, Mike had 45 books and Corey had twice as many books as Mike. On Wednesday, Mike gave 10 books to Lily, and Corey gave Lily 15 more than Mike gave. How many books did Lily get?
Let’s work this out in a step by step way to be sure we have the right answer.
35
Corey gave Lily 10 + 15 = 25 books to Lily.

Lily got 25 + 10 = 35 books.

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So, the answer is 35