Answer:
I couldnt write it on the computer because i wanted to draw other stuff to help you understand so i did it on paper. The photo is below!
Step-by-step explanation:
4
It's AoPS question
21 sweets
Colm : Gaz
4 : 3
4 units = 28
1 unit = 28 ÷ 4 = 7
3 units = 7 x 3 = 21 sweets