In what ratio must a merchant mix two varieties of oils worth Rs 60 kg and Rs 65 kg so that by selli...........

Explanation:

Let he mixes the oils in the ratio = x : y

Then, the cost price of the oils = 60x + 65y

Given selling price = Rs. 68.20

=Selling price = 68.20(x+y)

Given profit = 10% = SP - CP

=10/100 (60x + 65y) = 68.20(x+y)-(60x + 65y)

= 6x + 6.5y = 8.20x + 3.20y

=2.2x = 3.3y

=x : y = 3 : 2

Hence, option 2 is the correct answer.