The minuend, the sum of the subtrahend and the difference is 150, the subtrahend is 50 less than the minuend, what is the subtrahend.
被减数，减数与差的和是150，减数比被减数少50，减数是多少．
<gadget id="calculator">150 - 50 - 50</gadget>
<output>50</output>

<gadget id="calculator">1 + 1</gadget>
<output>2</output>

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

<result>25</result>