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%?

Answer: Option A

Explanation:

S.P. of 1 kg of the mixture = Rs. 68.20, Gain = 10%.

C.P. of 1 kg of the mixture = Rs.		100	x 68.20		= Rs. 62.
		110

By the rule of alligation, we have:

Cost of 1 kg tea of 1^st kind.Cost of 1 kg tea of 2^nd kind.
Rs. 60	Mean Price Rs. 62	Rs. 65
3		2

Required ratio = 3 : 2.