When a number is divided by 31, the quotient is 5 and the remainder is 28. What is the number?
一个数除以31，商是5，余数是28，这个数是多少．
<gadget id="calculator">31 * 5</gadget>
<output>155</output>

<gadget id="calculator">155 + 28</gadget>
<output>183</output>

<result>183</result>