(5/7) of a number is 35, what is (4/7) of this number.
一个数的(5/7)是35，这个数的(4/7)是多少．
<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">35 / (5/7)</gadget>
<output>49</output>

<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">49 * (4/7)</gadget>
<output>28</output>

<result>28</result>