The students in the first group of class 1 stand in a row. Numbers 1 to 9 are boys from left to right, and boys are number 11 to 15. How many boys are there in this group?
一1班第一组的同学站成一排，从左往右数1号～9号是男生，11号～15号也是男生，这个小组有多少名男生？
<gadget id="calculator">15 - 11</gadget>
<output>4</output>

<gadget id="calculator">4 + 1</gadget>
<output>5</output>

<gadget id="calculator">9 + 5</gadget>
<output>14</output>

<result>14</result>