human
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?
assistant
How many bones did Lassie have after Sunday? ** 35 bones at the end - 10 received = <<35-10=25>>25 on Sunday.
How many bones did Lassie have at the beginning? ** Lassie ate half, so multiply by two to find the number of bones at the beginning which is 25 * 2 = <<25*2=50>>50 bones.
#### 50