During routine workshop maintenance, 80 liters of used engine oil are collected. If each disposal drum has a marked capacity of 25 liters and regulations require drums to be filled to only 80 percent for safe transport, how many drums are required?
4 drums
This is a capacity problem: the drums cannot be filled to their marked 25 litres because safe-transport rules allow only 80 percent fill, so first find the real usable volume per drum.
Usable volume of one drum is 80 percent of 25 litres: \(25\times\frac{80}{100}=20\) litres per drum.
Now divide the total oil to be stored by the usable volume of each drum: \(\frac{80}{20}=4\) drums.
Check the fit: 4 drums at 20 litres each hold \(4\times20=80\) litres, exactly matching the collected oil with nothing left over.
Answers such as 3 drums fail because 3 drums hold only 60 litres, leaving 20 litres with no container, so at least 4 are needed.
Answers of 5 or 6 drums use more containers than required, since 4 already hold all 80 litres within the 80 percent limit.
Hence, the answer is 4 drums.
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