Adam has some stickers
He gives away ¹₃ and an additional 24 stickers to Bryan.
He gives away ¹₈ of the remainder and 21 more stickers to Chris
and ²₇ of the rest to David.
Adam has 20 stickers left.
How many stickers does he have at first?
Number of stickers that Adam gives to Bryan = ¹₃ of the total + 24
Number of stickers that Adam gives to Chris = ¹₈ of the remainder + 21
Number of stickers that Adam gives to David = ²₇ of the rest
Number of stickers left = 20


Working backwards.
1 - ²₇ = ⁵₇

⁵₇ of the rest → 20
¹₇ of the rest → 20 ÷ 5 = 4
⁷₇ of the rest → 7 x 4 = 28

1 - ¹₈ = ⁷₈

⁷₈ of the remainder = 21 + 28 = 49
¹₈ of the remainder = 49 ÷ 7 = 7
⁸₈ of the remainder = 8 x 7 = 56

1 - ¹₃ = ²₃
²₃ of the total = 56 + 24 = 80
¹₃ of the total = 80 ÷ 2 = 40
³₃ of the total = 3 x 40 = 120

Number of stickers at first = 120

Answer(s): 120