The age ratio of father, mother and Zhang Ming this year is 5:4:2, and the age sum of their whole family will be 146 years later. How old is Zhang Ming?
今年爸爸、妈妈和张明的年龄比是5：4：2，1年后他们全家的年龄和是146岁．张明今年多少岁？
<gadget id="calculator">146 - 3</gadget>
<output>143</output>

<gadget id="calculator">5 + 4 + 2</gadget>
<output>11</output>

<gadget id="calculator">2 / 11</gadget>
<output>2/11 = around 0.181818</output>

<gadget id="calculator">143 * (2/11)</gadget>
<output>26</output>

<result>26</result>