Discussion
Raju has turpentine oil in 5 containers each of 20 L size. He fills them in 10 cans of 5 L, 10 cans of 2 L and rest in 1 L cans. Number of 1 L cans filled is :
Answer: B
The number of 1 L cans is 30.
\[ \begin{aligned} \text{Total} &= 5 \times 20 = 100\ \text{L} \\ \text{Used} &= 10 \times 5 + 10 \times 2 = 70\ \text{L} \\ \text{Left} &= 100 - 70 = 30\ \text{L} \end{aligned} \]
30 L fills thirty 1 L cans. The other options come from miscounting the oil already poured into the 5 L or 2 L cans.
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