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 answer step by step:
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. The answer: 50.