Xiaoli is 6 years old this year. In 3 years, her father's age will be four times that of Xiaoli's. How old is her father this year?
小丽今年6岁，再过3年，爸爸的年龄是小丽的4倍，爸爸今年多少岁．
<gadget id="calculator">6 + 3</gadget>
<output>9</output>

<gadget id="calculator">9 * 4</gadget>
<output>36</output>

<gadget id="calculator">36 - 3</gadget>
<output>33</output>

<result>33</result>