A paint store was showcasing it’s new cobalt blue paint. Each paint drum, except one, was numbered as above. A boy passing the formation noticed that each side of the pyramid has numbers that add up to 16. Impressed by the boy’s observational skills, the store owner says he’ll reward the boy with a free paintbrush if he can figure out how to re-arrange the drums so that the three pyramid sides sum to the smallest possible number.
[in other words, all 3 sides have to add up to the same number. What is the smallest such number?]
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