Read the following table carefully and answer the questions given below it.
Sales of Aviator sun-glasses by six stores M, N, O, P, Q, and R during 5 years
What is the respective ratio between the average number of sun glasses sold by store P and store Q during all the given years ?
Total sun glasses sold by Store P = 670 + 490 + 870 + 790 + 585 = 3405
Total sun glasses sold by Store Q = 595 + 675 + 835 + 485 + 650 = 3240
=> Required ratio = $$\frac{3405}{5} : \frac{3240}{5}$$
= 681 : 648 = 227 : 216
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