The ratio of the divisor to the dividend is 1:3, the sum of the dividend, the divisor and the quotient is 12.6, what is the dividend.
除数和被除数的比是1：3，被除数、除数与商的和是12.6，被除数是多少．
<gadget id="calculator">2.4 * 3</gadget>
<output>7.2</output>

<result>7.2</result>