The ratio of the subtrahend and the difference is 3:4, the sum of the minuend, the subtrahend and the difference is 294, then what is the subtrahend.
减数和差的比是3：4，被减数、减数、差的和是294，则减数是多少．
<gadget id="calculator">3 + 4 + 3 + 4</gadget>
<output>14</output>

<gadget id="calculator">294 / 14</gadget>
<output>21</output>

<gadget id="calculator">21 * 3</gadget>
<output>63</output>

<result>63</result>