Two equal glasses are respectively one-third and one-fourth full of milk. They are then filled up with water and the contents are mixed in a tumbler. Ratio of milk and water in tumbler is:

A 7:5

B 7:17

C 3: 7

D 11:23

Correct Answer: Option B

Given two equal glasses are respectively one third =1/3

and one fourth full of milk=1/4

total milk in both glass=1/3+1/4=7/12

water in 1st glass=1-1/3=2/3

water in 2nd glass=1-1/4=3/4

total water=2/3+3/4=17/12

then ratio of milk and water =(7/12)/(17/12)

ratio of milk and water =7:17