Answer:
I got 350.
Step-by-step explanation:
You will understand that two of the squares is 140. Well there are three sets of two squares in the contaminated section. Then there is one more square, which is only half of 140, which is 70.
140 x 3 = 420.
420 + 70 = 490.
490 - 140 (Two squares) = 350.
I hope this helps!
