A number (3/8) minus 2.6 is exactly equal to 12.4. Find this number.
一个数的(3/8)减去2.6正好等于12.4．求这个数．
<gadget id="calculator">12.4 + 2.6</gadget>
<output>15</output>

<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">15 / (3/8)</gadget>
<output>40</output>

<result>40</result>