When a number is divided by 6, the quotient is 42 and the remainder is 3. What is the number?
一个数除以6，商是42，余数是3，这个数是多少．
<gadget id="calculator">6 * 42</gadget>
<output>252</output>

<gadget id="calculator">252 + 3</gadget>
<output>255</output>

<result>255</result>