Tabitha agreed to pay John and Jill $10 an hour to help clean out her attic and basement.  Jill worked 2 hours on Saturday and 1 hour on Sunday.  John worked twice as long as Jill on Saturday and three times as long as Jill on Sunday.  How much more money did John earn compared to Jill?
Jill worked 2 hours + 1 hour for a total of 3 hours.
Jill worked 3 hours at $10/hour so she made 3*$10 = $
<gadget id="calculator">3*10</gadget>
<output>30</output>
30.
John worked twice as long as Jill on Saturday so 2*2 = 
<gadget id="calculator">2*2</gadget>
<output>4</output>
4 hours.
John worked three times as long as Jill on Sunday so 3*1 = 
<gadget id="calculator">3*1</gadget>
<output>3</output>
3 hours.
John worked 4 hours + 3 hours for 7 hours.
John worked 7 hours at $10/hour so he made 7*10 = $
<gadget id="calculator">7*10</gadget>
<output>70</output>
70.
John made $70 while Jill made $30 so $70 - $30 = $
<gadget id="calculator">70-30</gadget>
<output>40</output>
40 more dollars.

<result>40</result>