I really don’t understand this question, please help.

It’s pretty simple all you have to do is look at the dual bar graph and the side of the dual bar graph so for a, it would be Bus, since it has the highest bar. For number 2 you need to colour in the last one « cycle » with blue since it represents girls. For c, it is t since you add up both and subtract and last d, is 12 girls in total.

I HOPE THIS HELPS <3

12+3b -1=-5-b -12-1+5=-b-3b -8=-4b