There are 480 girls in the experimental primary school, which is 40 fewer than the number of boys (4/5). How many boys are there in the experimental primary school?
实验小学有女生480人，比男生人数的(4/5)少40人．实验小学有男生多少人？
<gadget id="calculator">480 + 40</gadget>
<output>520</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">520 / (4/5)</gadget>
<output>650</output>

<result>650</result>