Jamie's father has to build a corral For her new pony. The plan shows the lengths of the sides of the corral. Jamie's father says the fence posts must be ten feet apart. How many fence posts must he buy. 50 ft 30 ft

For a 50 ft corral, he will need 6 fence posts (50 ft / 10 ft = 5 posts, plus 1 extra post for the corner).

For a 30 ft corral, he will need 4 fence posts (30 ft / 10 ft = 3 posts, plus 1 extra post for the corner).

So, Jamie's father will need to buy:
- 6 fence posts for the 50 ft corral
- 4 fence posts for the 30 ft corral

In total, he will need to buy 10 fence posts.