Amber worked for 12 hours last weekend. Armand worked one-third as long and Ella worked twice as long. How many hours did the 3 people work in total?
Armand = (1/3) * 12 = 
<gadget id="calculator">(1/3)*12</gadget>
<output>4</output>
4 hours.
Ella = 2 * 12 = 
<gadget id="calculator">2*12</gadget>
<output>24</output>
24 hours.
Total hours = 12 + 4 + 24 = 
<gadget id="calculator">12+4+24</gadget>
<output>40</output>
40 hours.
They worked a total of 40 hours.

<result>40</result>