The following bar graph shows the sales of books (in thousands) from six branches of a publishing company during two consecutive years 2018 and 2019. What is the ratio of the total sales of the first branch for for both years to the total sales of the fourth branch for both years? 
37 ∶ 36
Calculation:
T he total sales of the first branch for both years = 80 + 105 = 185 thousand
The total sales of the fourth branch for both years = 85 + 95 = 180 thousand
Now, the ratio = 185 : 180 = 37 : 36
∴ The ratio of the total sales of the first branch for both years to the total sales of the fourth branch for both years is 37 : 36.
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