The sum of the minuend, the subtrahend and the difference is 280, the subtrahend is the difference (3/4), what is the subtrahend.
被减数、减数与差的和是280，减数是差的(3/4)，减数是多少．
<gadget id="calculator">280 / 2</gadget>
<output>140</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 + (3/4)</gadget>
<output>7/4 = around 1.75</output>

<gadget id="calculator">140 / (7/4)</gadget>
<output>80</output>

<gadget id="calculator">80 * (3/4)</gadget>
<output>60</output>

<result>60</result>