Percy swims 1 hour before school and 1 after school 5 days a week.  He swims 3 hours on the weekend.  How many hours of swimming does he do over 4 weeks?
He swims 1 hour before and after school for a total of 1+1 = 
<gadget id="calculator">1+1</gadget>
<output>2</output>
2 hours.
He swims 2 hours a day for 5 days for a total of 2*5 = 
<gadget id="calculator">2*5</gadget>
<output>10</output>
10 hours.
He also swims an additional 3 hours on the weekend so 10+3 = 
<gadget id="calculator">10+3</gadget>
<output>13</output>
13 hours.
Over a course of 4 weeks, at 13 hours per week, he swims 4*13 = 
<gadget id="calculator">4*13</gadget>
<output>52</output>
52 hours.

<result>52</result>