Subtract 30 from a certain number, then multiply it by 5 times, and add 20 to equal 270. What is the number?
某数减去30，然后扩大5倍，再加上20等于270，这个数是多少．
<gadget id="calculator">270 - 20</gadget>
<output>250</output>

<gadget id="calculator">250 / 5</gadget>
<output>50</output>

<gadget id="calculator">50 + 30</gadget>
<output>80</output>

<result>80</result>