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?
35 bones at the end - 10 received = 
<gadget id="calculator">35-10</gadget>
<output>25</output>
25 on Sunday.
Lassie ate half, so multiply by two to find the number of bones at the beginning which is 25 * 2 = 
<gadget id="calculator">25*2</gadget>
<output>50</output>
50 bones.

<result>50</result>