Question 10291
Let's rewrite the equations: For brevity, b = bananas, c = coconuts, f = fish, and h = hammock.

50b = 20c, so c = (50/20)b = (5/2)b
30c = 12f, so f = (30/12)c = (5/2)c

Now: h = 100f = 100(5/2)c = 100(5/2)(5/2)b = 100(25/4)b = (25)(25)b = 625b.

1 hammock costs 625 bananas.