Jed is 10 years older than Matt. In 10 years, Jed will be 25 years old. What is the sum of their present ages?
Jed is 25 - 10 = 
<gadget id="calculator">25-10</gadget>
<output>15</output>
15 years old now.
So, Matt is 15 - 10 = 
<gadget id="calculator">15-10</gadget>
<output>5</output>
5 years old now.
Thus, the sum of their present ages is 15 + 5 = 
<gadget id="calculator">15+5</gadget>
<output>20</output>
20.

<result>20</result>