Discussion
In what ratio must a grocer mix teas worth Rs.60 a kg and Rs.65 a kg.So that by selling the mixture at Rs. 68.20 a kg, He may gain 10%?
Answer: A
Remove the profit first to get the cost price of the mixture.
\[ \text{CP} = \frac{68.20}{1.10} = \text{Rs. } 62 \]
\[ \frac{\text{Rs. 60 tea}}{\text{Rs. 65 tea}} = \frac{65 - 62}{62 - 60} = \frac{3}{2} \]
The mean must lie between the two prices; 68.20 does not, which is why it cannot be used directly.
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