Respuesta :
The whole rectangle should be seen as 8/8 (not 1 to make it easier)
4/8 +1/8 = 5/8
8/8-5/8 = 3/8
So, Pete painted 3/8 of the rectangle red
4/8 +1/8 = 5/8
8/8-5/8 = 3/8
So, Pete painted 3/8 of the rectangle red