The sum of the minuend, the subtrahend and the difference is 169, and the subtrahend is 15.5 larger than the difference. What is the subtraction.
被减数、减数与差的和是169，减数比差大15.5．减数是多少．
<gadget id="calculator">169 / 2</gadget>
<output>169/2 = around 84.5</output>

<gadget id="calculator">(169/2) + 15.5</gadget>
<output>100</output>

<gadget id="calculator">100 / 2</gadget>
<output>50</output>

<result>50</result>