Let's do some maths
4 people drink up 4 barrels of water in 4 days.
8 people drink up how many barrels of water in 8 days?

Congratulations, ONG JUAY SEONG
4 people drink up 4 barrels of water in 4 days.
So, 8 people drink up 8 barrels of water in 4 days.
They will drink up another 8 barrels of water in the next 4 days.
Therefore, 16 barrels in 8 days.
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