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by aatech » Wed May 28, 2008 8:06 am
550 is very easy no to break.. I will suggest write 550 as 11*5*5*2 and sum 11, 5 and 2 = 18
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by AleksandrM » Wed May 28, 2008 9:31 am
Yes, I approached it the same way and believe that is the shortest way of doing this.

550 = 55 x 10 = 5 x 11 x 2 x 5

5 + 11 + 2 = 18
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by poseid101 » Wed Jan 13, 2010 1:28 am
btw, had calculation error...
found out with help of https://www.wolframalpha.com/input/?i=550
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