1700 stickers are in 3 bags.
The 1st bag has 800 stickers more than the total number of stickers in the 3rd and 2nd bags.
The 2nd bag has 5 times as many stickers as the 3rd bag.
How many stickers does the 1st bag contain?
Choose the bag with the least stickers to be 1 u.

Number of stickers in the 3rd bag = 1 u
Number of stickers in the 2nd bag = 5 u

Number of stickers in the 3rd bag and 2nd bag
= 1 u + 5 u
= 6 u

Number of stickers in the 1st bag = 6 u + 800

Total number of stickers
= 1 u + 5 u + 6 u + 800
= 12 u + 800

12 u + 800 = 1700
12 u = 1700 - 800
12 u = 900

1 u = 900 ÷ 12 = 75

Number of stickers in the 1st bag
= 6 u + 800
= 6 x 75 + 800
= 450 + 800
= 1250

Answer(s): 1250