Wang Tao's grandfather is 2 years older than his grandmother, and his father is 2 years older than his mother. The five members of his family are 200 years old. It is known that the grandfather is 5 times the age of Wang Tao, and the age of the father is 4 times the age of Wang Tao four years ago. Ask Wang Tao how old this year.
王涛的爷爷比奶奶大2岁，爸爸比妈妈大2岁，全家五口人共200岁．已知爷爷年龄是王涛的5倍，爸爸年龄在四年前是王涛的4倍，问王涛今年多少岁．
<gadget id="calculator">4 * 4</gadget>
<output>16</output>

<gadget id="calculator">200 - 4 - 4</gadget>
<output>192</output>

<gadget id="calculator">2 + 16 + 16 + 2 + 192</gadget>
<output>228</output>

<gadget id="calculator">1 + 5 + 5 + 4 + 4</gadget>
<output>19</output>

<gadget id="calculator">228 / 19</gadget>
<output>12</output>

<result>12</result>