A family has three adults and children, both girls and boys. They went out for a family trip and prepared 3 dozen boiled eggs for the trip. Every adult got 3 eggs, and the boys each received 1 more egg than each girl since the girls had some snacks. How many boys went on the trip if the number of girls was 7 and each girl received an egg?
The total number of eggs the family had is 3 * 12 = 
<gadget id="calculator">3*12</gadget>
<output>36</output>
36 eggs.
If each adult received 3 eggs, the total number of eggs they got is 3 * 3 = 
<gadget id="calculator">3*3</gadget>
<output>9</output>
9 eggs.
The children shared 36 - 9 = 
<gadget id="calculator">36-9</gadget>
<output>27</output>
27 eggs.
Since each girl received an egg, the boys shared 27 - 7 = 
<gadget id="calculator">27-7</gadget>
<output>20</output>
20 eggs.
If each boy received 1 egg more than each girl, each received 1+1 = 
<gadget id="calculator">1+1</gadget>
<output>2</output>
2 eggs.
The boys received 20 eggs, and if each got 2 eggs, then 20/2 = 
<gadget id="calculator">20/2</gadget>
<output>10</output>
10 boys went on the trip.

<result>10</result>