If (3/5) of a number is 90, what is the reciprocal of this number?
一个数的(3/5)是90，则这个数的倒数是多少．
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">90 / (3/5)</gadget>
<output>150</output>

<gadget id="calculator">1 / 150</gadget>
<output>1/150 = around 0.006667</output>

<result>1/150 = around 0.006667</result>