How long is the rectangle? If the rectangle is only one tile long, then it will take 20 tiles.
5.6
Five. If one + is one tile, +++++ is five tiles long.
The answer will depend on how many titles make one tile. Assuming parity, you will need 2*4 = 8 tiles.
2
25
60
12
5 x 8 = 40, so 40 tiles are in this rectangle.
25
36
Twelve.