Divide a number by 6 and subtract 120 to get 30. What is the number?
一个数除以6，再减去120，得30，这个数是多少．
<gadget id="calculator">30 + 120</gadget>
<output>150</output>

<gadget id="calculator">150 * 6</gadget>
<output>900</output>

<result>900</result>