The sum of the minuend, the subtrahend and the difference is 120, and the subtrahend is 10 greater than the difference, then what is the difference.
被减数、减数与差的和是120，且减数比差大10，那么差是多少．
<gadget id="calculator">120 / 2</gadget>
<output>60</output>

<gadget id="calculator">60 - 10</gadget>
<output>50</output>

<gadget id="calculator">50 / 2</gadget>
<output>25</output>

<result>25</result>