Divide a number by the quotient of 2.5, then subtract 80, the difference is 21.6. What is this number?
一个数除以2.5的商，再减去80，差是21.6．这个数是多少？
<gadget id="calculator">21.6 + 80</gadget>
<output>101.6</output>

<gadget id="calculator">101.6 * 2.5</gadget>
<output>254</output>

<result>254</result>