Daquan's age this year is 15 times that of Koizumi, and in five years, Daquan's age will be 5 times that of Koizumi's. So, how much older is Oizumi than Koizumi?
大大泉今年的年龄是小小泉的15倍，再过5年大大泉的年龄就是小小泉的5倍．那么，大大泉的年龄比小小泉的年龄多多少岁？
<gadget id="calculator">5 * 5</gadget>
<output>25</output>

<gadget id="calculator">25 - 5</gadget>
<output>20</output>

<gadget id="calculator">15 - 5</gadget>
<output>10</output>

<gadget id="calculator">20 / 10</gadget>
<output>2</output>

<gadget id="calculator">14 * 2</gadget>
<output>28</output>

<result>28</result>