An animal shelter is having a pet adoption event where owners can adopt an animal for just the cost of the vet fees. Vet fees for dogs are $15, and vet fees for cats are $13. Eight families adopt dogs and three adopt cats. The vet donates a third of the fees they were paid for the adoption checkups back to the shelter. How many dollars did the vet donate?
The vet made 8 * 15 = $
<gadget id="calculator">8*15</gadget>
<output>120</output>
120 in dog vet fees.
The vet made 3 * 13 = $
<gadget id="calculator">3*13</gadget>
<output>39</output>
39 in cat vet fees.
The total vet fees were 120 + 39 = $
<gadget id="calculator">120+39</gadget>
<output>159</output>
159.
The vet donated 1/3 of the fees, so they donated 159 / 3 = $
<gadget id="calculator">159/3</gadget>
<output>53</output>
53 back to the shelter.

<result>53</result>