In what ratio must a grocer mix two varieties of tea 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%?

S.P. of 1 kg mixture = Rs. 68.20, Gain % = 10 % Hence, C.P. of 1 kg mixture = (100 / 110) x 68 20 . = Rs. 62 By the rule of alligation Hence, required ratio = 3 : 2