Answer:
30
Step-by-step explanation:
y varies directly with x, so:
y = kx
When x = n, y = 180.
180 = kn
When x = 5, y = n.
n = 5k
Solve for k in the first equation:
k = 180 / n
Substitute into the second equation:
n = 5 (180 / n)
n = 900 / n
n² = 900
n = 30
