John brings his dog to the vet. His dog needs 2 vaccines, which are $20 each, and a heartworm check. The heartworm check is 60% of his total bill. If he brought $125 with him, how much does he leave with?
The vaccines cost 40 because 2 x 20 = 
<gadget id="calculator">2*20</gadget>
<output>40</output>
40.
The vaccines are 40% of his total bill because 100 - 60 = 
<gadget id="calculator">100-60</gadget>
<output>40</output>
40.
The total bill is $100 because 40 / .4 = 
<gadget id="calculator">40/.4</gadget>
<output>100</output>
100.
He leaves with $25 because 125 - 100 = 
<gadget id="calculator">125-100</gadget>
<output>25</output>
25.

<result>25</result>