Gervais drove an average of 315 miles for 3 days. Henri drove a total of 1,250 miles over one week. How many miles farther did Henri drive?
Gervais drove 3*315 = 
<gadget id="calculator">3*315</gadget>
<output>945</output>
945 miles
1250 - 945 = 
<gadget id="calculator">1250-945</gadget>
<output>305</output>
305 miles.
Henri drove 305 miles farther.

<result>305</result>