Lets look at the information we have:-
6.8 pounds on Sunday
8.75 pounds on Monday
How many pounds did he collect together on these 2 days?
Add:-
6.8 + 8.75 = 15.55
Dan collected 15.55 pounds of aluminum on these 2 days.Β
CHECK OUR WORK:-
15.55 - 8.75 = 6.8
We were RIGHT!!Β
So,Β Dan collected 15.55 pounds of aluminum on these 2 days.Β
Hope I helped ya!! xDΒ