railway RRB JE (CBT I + CBT II) Mock Test 2024 Quantitative Aptitude Mixture Problems

From a container of 50 liters pure milk, 10 liters is taken out and replaced by 10 liters of water. If this process is repeated thrice, what is the ratio of water and milk finally?

1
7 : 16
2
61 : 64
3
9 : 16
4
1 : 4
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