(5/7) of a number is 45, what is (4/9) of this number.
一个数的(5/7)是45，这个数的(4/9)是多少．
<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">45 / (5/7)</gadget>
<output>63</output>

<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">63 * (4/9)</gadget>
<output>28</output>

<result>28</result>