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? Choose one.
A) 1 : 3
B) 2 : 3
C) 3 : 4
D) 6 : 7
E) None of these
Solution   Required ratio = 60 : 70 = 6 : 7   Answer 6 : 7
<result>D</result>
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?