Answer:
I came up with -12
Step-by-step explanation:
8 workers = 6 days to complete
x workers = 4 days faster to complete
6/4=1.5 days faster
1.5 x 8 = 12 workers needed to complete the wall in fours days
a = 20(hypotenuse)
b = 12(leg)
z = ?
z= = 16
18/30=3/5
6 boxes.