In a division formula, if the dividend is increased by 15, the quotient will increase by 3 and the remainder will remain the same. If it is decreased by 45 and the remainder will remain the same, the quotient will decrease by how much.
在一个除法算式里，如果被除数增加15，商会增加3，余数不变，如果减少45，余数不变，商会减少多少．
<gadget id="calculator">15 / 3</gadget>
<output>5</output>

<gadget id="calculator">45 / 5</gadget>
<output>9</output>

<result>9</result>