Martha has 18 crayons. She lost half of them, so she bought a new set of 20 crayons. How many crayons in total does Martha have after the purchase?
In the beginning, Martha lost 18 / 2 = 
<gadget id="calculator">18/2</gadget>
<output>9</output>
9 crayons.
So after she bought a set of new crayons, she has in total 9 + 20 = 
<gadget id="calculator">9+20</gadget>
<output>29</output>
29 crayons.

<result>29</result>