In what ratio must a grocer mix two varieties of pulses costing Rs.15 and Rs.20 per kg respectively so as to get a mixture worth Rs.16.50 per Kg? Select:
A) 3 : 7
B) 5 : 7
C) 7 : 3
D) 7 : 5
E) None
Solution   Required ratio = 3.50 : 1.50 = 35 : 15 = 7 : 3.   Answer 7 : 3
<result>C</result>
In what ratio must a grocer mix two varieties of pulses costing Rs.15 and Rs.20 per kg respectively so as to get a mixture worth Rs.16.50 per Kg?