Sara is 6 inches taller than her brother Joe. Joe is 3 inches taller than his friend Roy. If Roy is 36 inches tall, how tall is Sara?
Roy is 
<gadget id="calculator">36</gadget>
<output>36</output>
36 inches tall.
Joe is 3+36=
<gadget id="calculator">3+36</gadget>
<output>39</output>
39 inches tall.
Sara is 6+39=
<gadget id="calculator">6+39</gadget>
<output>45</output>
45 inches tall.

<result>45</result>