Comprehension Passage
Direction: Read the following Bar graph carefully and answer the following questions.
The following bar graph shows the number of days and percent of work done in given number of days by different persons.
What will be the ratio between efficiency of A to efficiency of D?
1
2 ∶ 1
2
3 ∶ 1
3
1 ∶ 3
4
1 ∶ 2