(1/10) of a number is 90, what is this number?
一个数的(1/10)是90，这个数是多少．
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">90 / (1/10)</gadget>
<output>900</output>

<result>900</result>