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?  Select the correct option
A) 1 : 3	B) 2 : 3	C) 3 : 4	D) 7 : 9	E) None of these
Solution   Required ratio = 70 : 90 = 7 : 9   Answer 7 : 9
<result>D</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?