On average, of a forum of 3000-10000 posts, 3 admins is enough. 4-5 Super Moderators should be enough to keep the forum clean.
An average child should really play at least one sport. Unless, they will gain no confidence, or socilaism. However, no more than two is necessary.
Everyday an average person should drink 8 cups of water.
From a premium golf ball you would get about 1 full round before it shows heavy signs of wear. For a cheaper golf ball you could get 2-3 rounds. To be honest, you could probably get around 500 full...
2700 calories
About 2,000 at the least 5,000 at the max.