In a subtraction formula, the sum of the minuend, the subtrahend, and the difference is 60. It is known that the difference is (2/3) of the subtrahend. What is the difference?
在一个减法算式中，被减数、减数、差的和是60，已知差是减数的(2/3)，差是多少．
<gadget id="calculator">60 / 2</gadget>
<output>30</output>

<gadget id="calculator">2 + 3</gadget>
<output>5</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">30 * (2/5)</gadget>
<output>12</output>

<result>12</result>