Correct option is D
Formula used:
Average=
Solution:
The production of company X in the year 3 to 5 is = 35 + 55+ 50 = 140 tonnes
Average =
The production of company Y in the year 3 to 5 is = 45 + 45 + 55 = 145
Average =
The ratio of the average production by branch X and branch Y is = = 28 : 29
Thus, the correct option is (D)









