A alone can do a work in 12 days. A and B together finished work and got rs.54 and rs.18 respectively. In how many days was the work finished?
Options: A) 12 B) 14 C) 9 D) 10 E) 8
A does the work in 12 days   and A and B together finished work and got rs.54 and rs.18 respectively   so B will do work in  12*3= 
<gadget id="calculator"> 12*3</gadget>
<output>36</output>
36 days (because he got 1/3 money relative to other)   so one day work= 1/12 + 1/36 = 4/36 = 1/9   so total days required = 9   ANSWER:9
<result>C</result>
A alone can do a work in 12 days. A and B together finished work and got rs.54 and rs.18 respectively. In how many days was the work finished?