Find the ratio in which rice at Rs. 7.20 a kg be mixed with rice at Rs. 5.60 a kg to produce a mixture worth Rs. 6.30 a kg  Choose the correct option.
A) 2:0 B) 2:3 C) 2:1 D) 2:2 E) 7:9
By the rule of alligation:   Cost of 1 kg rice of 1st kind Cost of 1 kg rice of 2nd kind   Required ratio = 70 : 90 = 7 : 9   Answer: 7:9
<result>E</result>
Find the ratio in which rice at Rs. 7.20 a kg be mixed with rice at Rs. 5.60 a kg to produce a mixture worth Rs. 6.30 a kg