There are 42 white rabbits and gray rabbits in the cage, among which the white rabbits account for the total number (3/7), and later put some white rabbits into the cage, at this time the white rabbits account for the total number (4/7) ． How many white and gray rabbits are there in the cage now?
笼子里有白兔和灰兔共42只，其中白兔占总数的(3/7)，后来又往笼子里放入若干只白兔，这时白兔占总只数的(4/7)．现在笼子里有白兔和灰兔共多少只？
<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">1 - (3/7)</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">42 * (4/7)</gadget>
<output>24</output>

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

<gadget id="calculator">1 - (4/7)</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">24 / (3/7)</gadget>
<output>56</output>

<result>56</result>