This year, Grandpa Xiaohua's age is 6 times of Xiaohua's age. After 3 years, Grandpa Xiaohua's age is 5 times of Xiaohua's age. So how old is Xiaohua this year?
今年，小华爷爷的年龄是小华年龄的6倍，3年后，小华爷爷的年龄是小华年龄的5倍，那么小华今年多少岁．
<gadget id="calculator">5 * 3</gadget>
<output>15</output>

<gadget id="calculator">15 - 3</gadget>
<output>12</output>

<gadget id="calculator">6 - 5</gadget>
<output>1</output>

<gadget id="calculator">12 / 1</gadget>
<output>12</output>

<result>12</result>