A sports school originally had 400 students, of which the ratio of boys to girls was 5:3; another group of boys was recruited, and now boys accounted for 3/4 of the total number. How many boys have been recruited?
某体育运动学校原有400人，其中男生与女生人数的比是5：3；又招进一批男生，这时男生占总人数的(3/4)．又招进男生多少人？
<gadget id="calculator">5 + 3</gadget>
<output>8</output>

<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">400 * (3/8)</gadget>
<output>150</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 - (3/4)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">150 / (1/4)</gadget>
<output>600</output>

<gadget id="calculator">600 - 400</gadget>
<output>200</output>

<result>200</result>