When two natural numbers are divided, the quotient is 5 and the remainder is 7. What is the smallest divisor?
两个自然数相除，商是5，余数是7，被除数最小是多少．
<gadget id="calculator">7 + 1</gadget>
<output>8</output>

<gadget id="calculator">5 * 8</gadget>
<output>40</output>

<gadget id="calculator">40 + 7</gadget>
<output>47</output>

<result>47</result>