There are three bottles of mixture of syrup and water of

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There are three bottles of mixture of syrup and water of ratios 2 : 3, 3 : 4 and 7 : 5. 10 litres of the first and 21 litres of the second bottles are taken. How much quantity from third bottle is to be taken so that final mixture from three bottles will be of ratios 1 : 1.

1. 25 litres
2. 20 litres
3. 35 litres
4. 30 litres

Correct Option: D

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