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? Select the correct option:
A) 1 : 3	B) 2 : 3	C) 3 : 4	D) 4 : 5	E) none of these

Rationale: solution required ratio = 60 : 90 = 2 : 3 answer b
Answer: B