The table given below shows the production of tea by two companies A and B in 6 years.

Companies	A	B
Y1	60	75
Y2	80	90
Y3	70	50
Y4	50	40
Y5	45	35
Y6	55	45

What is the sum of the average production of tea by B in years Y1 and Y2 and the average production of tea by A in year Y3 and Y4?