The given bar graph shows the sales of cars from six branches of a dealer B1, B2. B3, B4, B5. B6, during two consecutive years 2018 and 2019. Blue colour corresponds to the year 2018 and red colour corresponds to the year 2019.

In the bar graph, the ratio of the total sales from branches B1, B2 and B3 taken together for the year 2018 to the sales from the branches B6, B4 and BS for the year 2019, is: