In a division formula, the sum of dividend, divisor, quotient and remainder is 127. It is known that the quotient is 3 and the remainder is 2. So what is the divisor? (solution by equation)
在一个除法算式里，被除数、除数、商与余数的和是127，已知商是3，余数是2，那么除数是多少？(用方程解)
<gadget id="calculator">127 - 2 - 3 - 2</gadget>
<output>120</output>

<gadget id="calculator">3 + 1</gadget>
<output>4</output>

<gadget id="calculator">120 / 4</gadget>
<output>30</output>

<result>30</result>