A jug is filled with 5 liters of water and a bucket is filled with 4 jugs. How many liters of water are contained in 2 buckets?
4 jugs contain 4*5 = 
<gadget id="calculator">4*5</gadget>
<output>20</output>
20 liters of water.
2 bucket contains 20*2 = 
<gadget id="calculator">20*2</gadget>
<output>40</output>
40 liters of water.

<result>40</result>