There are 160 girls in the fifth grade, 20% less than boys. How many people are there in fifth grade?
五年级有女生160人，比男生少20%．五年级共有多少人？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">160 / (4/5)</gadget>
<output>200</output>

<gadget id="calculator">200 + 160</gadget>
<output>360</output>

<result>360</result>