(2/5) of a number is 60, what is (1/2) of this number.
一个数的(2/5)是60，这个数的(1/2)是多少．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">60 / (2/5)</gadget>
<output>150</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">150 * (1/2)</gadget>
<output>75</output>

<result>75</result>