Posted by deadlove on Wednesday, February 1, 2012 at 1:29am.
July 2: 5
July 3: 11
July 4: 18
July 5: 26
July 6: 35
July 7: 45
July n: 5 + 6 +.. + (n+3)
= 4(n-1) + 1 + 2 +...+ (n-1)
= 4(n-1) + (n-1)n/2
July 30 = 4*29 + 30*29/2 = 551
Looks like you're one day off. On July 1 the sheep ate 5 carrots.
on July nth, the sheep eats n(n+9)/2 carrots.
On July 30, that's 30(39)/2 = 15*39 = 585 carrots
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