Two types of mixture containing milk and water in ratio 7 ∶ 5 and 5 ∶ 13 are mixed in what ratio so as to get a new mixture containing milk and water in ratio 3 ∶ 5.

1
7 ∶ 15
2
15 ∶ 7
3
8 ∶ 13
4
13 ∶ 8
5
None of these

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