The dividend is 75 and the divisor is 15. Now add 15 to the divisor. To keep the quotient unchanged, how many times should the dividend be enlarged?
被除数是75，除数是15，现在除数加15，要使商不变，被除数扩大多少倍
<gadget id="calculator">15 + 15</gadget>
<output>30</output>

<gadget id="calculator">30 / 15</gadget>
<output>2</output>

<result>2</result>