Harry slept 9 hours last night. His friend James slept only 2/3 of what Harry slept. How many more hours did Harry sleep than James?
James slept 9 hours * 2/3 = 
<gadget id="calculator">9*2/3</gadget>
<output>6</output>
6 hours.
So, Harry slept 9 - 6 = 
<gadget id="calculator">9-6</gadget>
<output>3</output>
3 hours more than James.

<result>3</result>