A certain school sent 200 students to participate in the summer camp. It turned out that boys accounted for 40%. In order to make boys and girls account for 50% each, another group of boys was sent. How many boys were sent?
某校选派200名学生参加夏令营，结果发现男生占了40%，为了使男、女生各占50%，又增派了一批男生，增派的男生有多少名？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">200 * (3/5)</gadget>
<output>120</output>

<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 - (1/2)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">120 / (1/2)</gadget>
<output>240</output>

<gadget id="calculator">240 - 200</gadget>
<output>40</output>

<result>40</result>