SOLUTION: Each year on Colin’s birthday (since his first birthday), he celebrates with a birthday cake and the number of candles on the cake is always equal to his age. If he has had a total

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Question 285783: Each year on Colin’s birthday (since his first birthday), he celebrates with a birthday cake and the number of candles on the cake is always equal to his age. If he has had a total of 253 candles on his birthday cakes, how old is he?
A.22 B. 20 C. 24 D. 19 E. None of these.

Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
253=n*(n+1)/2
506=n*(n+1)
n=22
A. 22
1+2+3+4+ 19+20+21+22=253