In a subtraction formula, the sum of the minuend, the subtrahend and the difference is 240, and the subtrahend is 5 times the difference. What is the subtrahend?
在一个减法算式里，被减数、减数与差的和是240，减数是差的5倍，则减数是多少？
<gadget id="calculator">1 + 5 + 5 + 1</gadget>
<output>12</output>

<gadget id="calculator">240 / 12</gadget>
<output>20</output>

<gadget id="calculator">20 * 5</gadget>
<output>100</output>

<result>100</result>