There are 120 girls in the fourth grade of Banqiao Primary School, and 105 boys are twice as many as girls. How many students are there in the fourth grade?
板桥小学四年级有女生120人，男生人数比女生的2倍少105人．四年级共有学生多少人？
<gadget id="calculator">120 * 2</gadget>
<output>240</output>

<gadget id="calculator">240 - 105</gadget>
<output>135</output>

<gadget id="calculator">135 + 120</gadget>
<output>255</output>

<result>255</result>