Jason joined the military when he turned 18.  It took him 8 years to raise to the rank of chief.  Then 25% longer than that to go from chief to master chief.  He then spent 10 years more in the military before retiring.  How old was he when he retired?
It took 8*.25=
<gadget id="calculator">8*.25</gadget>
<output>2</output>
2 years longer to go from chief to master chief than to get chief.
So it takes him 8+2=
<gadget id="calculator">8+2</gadget>
<output>10</output>
10 years to become a master chief.
That means he took 10+8=
<gadget id="calculator">10+8</gadget>
<output>18</output>
18 years to reach master chief from enlisting.
So he was in the military for 18+10=
<gadget id="calculator">18+10</gadget>
<output>28</output>
28 years.
So he was 28+18=
<gadget id="calculator">28+18</gadget>
<output>46</output>
46 when he retired.

<result>46</result>