Emma is 7 years old.  If her sister is 9 years older than her, how old will Emma be when her sister is 56?
Emma's sister is 7 + 9 = 
<gadget id="calculator">7+9</gadget>
<output>16</output>
16 years old.
In this many years, Emma's sister will be 56 years old: 56 - 16 = 
<gadget id="calculator">56-16</gadget>
<output>40</output>
40 years.
When her sister is 56 years old, Emma will be 7 + 40 = 
<gadget id="calculator">7+40</gadget>
<output>47</output>
47 years.

<result>47</result>