Matt can write 10 words a minute with his right hand and 7 words a minute with his left hand. How many words would Matt write in 5 minutes with his right hand than with his left?
The difference in writing speed is 10 words/minute - 7 words/minute = 
<gadget id="calculator">10-7</gadget>
<output>3</output>
3 words/minute.
Matt can write 3 words/minute x 5 minutes = 
<gadget id="calculator">3*5</gadget>
<output>15</output>
15 more words with his right hand.

<result>15</result>