There are 48 students in class 1 of the fourth grade. If 3 more boys are transferred, then the number of boys is twice the number of girls. How many boys are there in the third grade?
四年级1班有学生48人，如果再转来3名男生，那么男生的人数是女生人数的2倍，三年级有男生有多少人？
<gadget id="calculator">48 + 3</gadget>
<output>51</output>

<gadget id="calculator">1 + 2</gadget>
<output>3</output>

<gadget id="calculator">51 / 3</gadget>
<output>17</output>

<gadget id="calculator">2 * 17</gadget>
<output>34</output>

<result>34</result>