Explanation:
x be the number of oranges
x + (x+2) = $4.20
2x + 2 = 4.20
2x = 2.20
x = 1.1
if you wanna check,
1.1 + (1.1 + 2) =$4.20
1.1 + 3.1 =$4.20
4.2 =$4.20
Alex = x = 1.1 oranges
Bobbie = (x+2) = 1.1 + 2 = 3.1 oranges
I'm not sure of the answer tho^^