Liangliang is 10 years old this year. Three years ago, his father was five times his age. How old is his father this year?
亮亮今年10岁，3年前爸爸的年龄是他的5倍，爸爸今年多少岁．
<gadget id="calculator">10 - 3</gadget>
<output>7</output>

<gadget id="calculator">7 * 5</gadget>
<output>35</output>

<gadget id="calculator">35 + 3</gadget>
<output>38</output>

<result>38</result>