a shaded portion of a rectangle is 2/5 of the total area....How much of the total area is not shaded...A.5/2 B.3/5 c.5/3 d.3/10.

5/5 - 2/5 = ?

B 3/5

To find the answer, let's assume the total area of the rectangle is 5 units (you can choose any value for convenience).

Since the shaded area is 2/5 of the total area, we can calculate the shaded area by multiplying the total area by 2/5:
Shaded area = (2/5) * 5 = 2 units

Now, to find the area that is not shaded, we subtract the shaded area from the total area:
Not shaded area = Total area - Shaded area = 5 - 2 = 3 units

Finally, we need to express the not shaded area as a fraction of the total area:
Not shaded area / Total area = 3/5

Therefore, the answer is 3/5 (option B).