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How much Pepsi at Rs. 6 a liter is added to 15 liters of ‘dew’ at Rs. 10 a liter so that the price of the mixture is Rs. 9 a liter? (in liters)

How much Pepsi at Rs. 6 a liter is added to 15 liters of ‘dew’ at Rs. 10 a liter so that the price of the mixture is Rs. 9 a liter? (in liters) Correct Answer 5

Formula:

Mixture and Allegation method:

a                               b

                  c

p                ∶              q

Where, a > c > b

(a – c)/(c – b) = p/q

Calculation:

Rs. 6                          Rs. 10

                 Rs. 9

1                    ∶            3

⇒ Ratio of the quantity of drink of Rs. 6 to that of Rs. 10 = 1 ∶ 3 (or x ∶ 3x)

According to the question,

3x = 15 litres

⇒ x = 15/3

⇒ x = 5 litres

∴ The required quantity of Pepsi is 5 litres.

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