When two numbers are divided, the quotient is 5, the divisor is 20, what is the largest dividend.
两个数相除，商是5，除数是20，被除数最大是多少．
<gadget id="calculator">5 * 20</gadget>
<output>100</output>

<gadget id="calculator">20 - 1</gadget>
<output>19</output>

<gadget id="calculator">100 + 19</gadget>
<output>119</output>

<result>119</result>