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primary 5 | Maths
| Fractions
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half-filled: total = 17 2/3
bottle = 17 2/3 - 2u
quarter-filled: total = 10 1/6
bottle = 10 1/6 - 1u
17 2/3 - 2u = 10 1/6 - 1u
1u = 17 2/3 - 10 1/6 = 7 1/2 kg
bottle = 10 1/6 - 7 1/2 = 2 2/3 kg
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