(2/3) of a number is 50, what is (7/15) of it.
一个数的(2/3)是50，它的(7/15)是多少．
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">50 / (2/3)</gadget>
<output>75</output>

<gadget id="calculator">7 / 15</gadget>
<output>7/15 = around 0.466667</output>

<gadget id="calculator">75 * (7/15)</gadget>
<output>35</output>

<result>35</result>