There are 450 students in a certain elementary school, the number of girls (3/5) is exactly equal to the number of boys 75%. How many boys are there? (Think about it first: what is the ratio of the number of boys to girls?)
某小学有学生450人，女生人数的(3/5)和男生人数的75%正好相等．男生有多少人？(先想一想：男、女生人数的比是几比几)
<gadget id="calculator">4 + 5</gadget>
<output>9</output>

<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">450 * (4/9)</gadget>
<output>200</output>

<result>200</result>