In a subtraction formula, the ratio of the subtrahend to the difference is 2:3, the minuend is 15, what is the subtrahend
在一道减法算式中，减数与差的比是2：3，被减数是15，减数是多少
<gadget id="calculator">15 / 5</gadget>
<output>3</output>

<gadget id="calculator">3 * 2</gadget>
<output>6</output>

<result>6</result>