Adam has some stickers
He gives away ¹₃ and an additional 19 stickers to Bryan.
He gives away ³₇ of the remainder and 11 more stickers to Chris
and ²₅ of the rest to David.
Adam has 15 stickers left.
How many stickers does he have at first?
Number of stickers that Adam gives to Bryan = ¹₃ of the total + 19
Number of stickers that Adam gives to Chris = ³₇ of the remainder + 11
Number of stickers that Adam gives to David = ²₅ of the rest
Number of stickers left = 15


Working backwards.
1 - ²₅ = ³₅

³₅ of the rest → 15
¹₅ of the rest → 15 ÷ 3 = 5
⁵₅ of the rest → 5 x 5 = 25

1 - ³₇ = ⁴₇

⁴₇ of the remainder = 11 + 25 = 36
¹₇ of the remainder = 36 ÷ 4 = 9
⁷₇ of the remainder = 7 x 9 = 63

1 - ¹₃ = ²₃
²₃ of the total = 63 + 19 = 82
¹₃ of the total = 82 ÷ 2 = 41
³₃ of the total = 3 x 41 = 123

Number of stickers at first = 123

Answer(s): 123