Lassie eats half of her bones on Saturday. On Sunday she received 10 more bones. She now has a total of 35 bones. How many bones did she start with before eating them on Saturday?
Let's be accurate as possible. Think before you answer.
50
35 bones at the end - 10 received = 25 on Sunday.

Lassie ate half, so multiply by two to find the number of bones at the beginning which is 25 * 2 = 50 bones.

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So, the answer is 50