Find the ratio in which rice at Rs.7.20 a kg be mixed with rice at Rs.5.70 a kg to produce a mixture worth Rs.6.30 a kg?  Choose the most appropriate option:
A) 1 : 3
B) 2 : 3
C) 3 : 4
D) 4 : 5
E) None of these
Solution   Required ratio = 60 : 90 = 2 : 3   Answer 2 : 3
<result>B</result>
Find the ratio in which rice at Rs.7.20 a kg be mixed with rice at Rs.5.70 a kg to produce a mixture worth Rs.6.30 a kg?