That is actually true. Everything thats multiplied by 0 eaquals 0.
I’d say it’s around 405.58
16
––
30
because there are 30 inches in all and 16 out of the 30 are concrete
cross multiply to find your answer
x/250 = 20/100
250 X 20= 5000
5000=100x
x = 50
250 - 50 = 200
hope this helps :)
