When a number is divided by 15, if the dividend increases by 30, how much will the quotient increase.
当一个数除以15时，如果被除数增加30，那么商就会增加多少．
<gadget id="calculator">150 + 30</gadget>
<output>180</output>

<gadget id="calculator">180 / 15</gadget>
<output>12</output>

<gadget id="calculator">150 / 15</gadget>
<output>10</output>

<gadget id="calculator">12 - 10</gadget>
<output>2</output>

<result>2</result>