(2/5) of a number is 5, find this number. The correct column is. How many
一个数的(2/5)是5，求这个数．正确的列式为．多少
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">5 / (2/5)</gadget>
<output>25/2 = around 12.5</output>

<result>25/2 = around 12.5</result>