Two vessels of equal volume contain milk and water in the ratio 1 : 3 and 2 : 1. If they are mixed together, what is the new ratio?

Two vessels of equal volume contain milk and water in the ratio 1 : 3 and 2 : 1. If they are mixed together, what is the new ratio?
1). 11 : 13
2). 13 : 11
3). 9 : 11
4). 11 : 9

From the given data,

⇒ New ratio = (1/4 + 2/3)/(3/4 + 1/3) = [(3 + 8)/12]/[(9 + 4)/12] = 11 : 13

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