- 3 : 2
- 2 : 3
- 3 : 4
- 4 : 3
- None of the above/More than one of the above.

Option 1 : 3 : 2

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The correct answer is __ 3 : 2__.

Say the mixture is in the ratio 1: A

⇒ For 1 kg amount of Rs.10 tea, A kg amount of Rs.15 tea is added.

Price of mixture = (1 × 10 + A × 15) = 10 + 15A

Price of mixture per kg \(= \frac{{10{\rm{}} + {\rm{}}15{\rm{A}}}}{{1{\rm{}} + {\rm{A}}}} = {\rm{Rs}}.12\)

⇒ 10 + 15A = 12 × (1 + A)

⇒ 10 + 15A = 12 + 12A

⇒ 3A = 2

⇒ A = 2/3

∴ Ratio 1 : A = 1: 2/3 = 3 : 2
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