The weights of Christine's two cats are 7 and 10 pounds. What is her dog's weight if its weight is twice the sum of her two cats' weights?
The sum of the weights of Christine's two cats is 7 + 10 = 
<gadget id="calculator">7+10</gadget>
<output>17</output>
17 pounds.
Christine's dog weighs 17 x 2 = 
<gadget id="calculator">17*2</gadget>
<output>34</output>
34 pounds.

<result>34</result>