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After u days,

Tank A would have (48 + 3u) litres of water

Tank B would have (90 + 7.5u) litres of water

 

Tank B has twice the amount of water as Tank A

90 + 7.5u = 2 × (48 + 3u)

90 + 7.5u = 96 + 6u

1.5u = 6

u = 4

 

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its 5 days, A 60l and B 120l 

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