In the given bar-chart, the ratio of total sales of branches B1, B3 and B5 to total sales of branches B2, B4 and B6 taken together for both the years (in thousand numbers) is:

Total sales of B1(in thousands) = 105+80 = 185
Total sales of B3(in thousands) = 95+110 = 205
Total sales of B5(in thousands) = 75+95 = 170
Total sales of B1, B3 and B5 together(in thousands) = 185+205+170 = 560
Total sales of B2(in thousands) = 75+65 = 140
Total sales of B4(in thousands) = 85+95 = 180
Total sales of B6(in thousands) = 70+80 = 150
Total sales of B2, B4 and B6 together(in thousands) = 140+180+150 = 470
Therefore, Ratio = 560 : 470 = 56 : 47.