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## Question

primary 6 | Maths
| Algebra

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8 buckets = 4u

3 buckets + 14 bottles = 5u

8 buckets = 4u

12 buckets = 6u

3 buckets + 14 bottles = 5u

12 buckets + 56 bottles = 20u

by replacement,

12 buckets + 56 bottles = 20u

6u + 56 bottles = 20u

56 bottles = 14u

4 bottles = 1 u

36 bottles = 9 u = full tank

need 36 bottles to fill up the tank.

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