The divisor is 50, the quotient and remainder are both 42, what is the dividend.
除数是50，商和余数都是42，被除数是多少．
<gadget id="calculator">42 * 50</gadget>
<output>2_100</output>

<gadget id="calculator">2_100 + 42</gadget>
<output>2_142</output>

<result>2_142</result>