In 2003, the age of the grandfather was 10 times the age of the grandson. After 12 years, the age of the grandfather is 4 times the age of the grandson. So how old is the grandson in 2016?
2003年爷爷的年龄是孙子年龄的10倍，再过12年，爷爷的年龄是孙子年龄的4倍，那么2016年孙子是多少岁．
<gadget id="calculator">2_016 - 2_003</gadget>
<output>13</output>

<gadget id="calculator">12 * 4</gadget>
<output>48</output>

<gadget id="calculator">48 - 12</gadget>
<output>36</output>

<gadget id="calculator">10 - 4</gadget>
<output>6</output>

<gadget id="calculator">36 / 6</gadget>
<output>6</output>

<gadget id="calculator">13 + 6</gadget>
<output>19</output>

<result>19</result>