(4/7) of a number is 28, what is (5/49) of this number.
一个数的(4/7)是28，这个数的(5/49)是多少．
<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

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

<gadget id="calculator">5 / 49</gadget>
<output>5/49 = around 0.102041</output>

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

<result>5</result>