Find the ratio in which rice at Rs. 7.00 a kg be mixed with rice at Rs. 5.70 a kg to produce a mixture worth Rs. 6.30 a kg	Pick one:  A) 6 : 7  B) 2 : 3  C) 2 : 1  D) 2 : 2  E) 2 : 8

Rationale: "by the rule of alligation : cost of 1 kg rice of 1 st kind cost of 1 kg rice of 2 nd kind required ratio = 60 : 70 = 6 : 7 answer : a"
Answer: A