The total number of stickers he had at first is 56
How many stickers did he have at first?
From the question, we have the following parameters that can be used in our computation:
Hashim = 3/8
Rani = 1/4
Amount left = 21
Represent the initial number of stickers with x
So, we have
x - 3/8x - 1/4x = 21
Multiply through by 8
8x - 3x - 2x = 168
This gives
3x = 168
Divide through by 3
x = 56
Hence, he has 56 stickers at first