The sum of two numbers is 28, the large number is divided by the decimal quotient 3, and there is no remainder, what is the large number.
两个数之和是28，大数除以小数商3，且没有余数，大数是多少．
<gadget id="calculator">3 + 1</gadget>
<output>4</output>

<gadget id="calculator">28 / 4</gadget>
<output>7</output>

<gadget id="calculator">7 * 3</gadget>
<output>21</output>

<result>21</result>