Are all the numbers of a certain list of 15 numbers equal?
1) the sum of all the numbers in the list is 60.
2)the sum of any 3 numbers in the list is 12.
How can this problem solved in an easier way than the one offered at the Official guide problem-133?
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are all the numbers of certain list of 15 numbers equal?
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from given, we have an instinct that all the numbers has to be 4, while few numbers can be around itTaniuca wrote:Are all the numbers of a certain list of 15 numbers equal?
1) the sum of all the numbers in the list is 60.
2)the sum of any 3 numbers in the list is 12.
How can this problem solved in an easier way than the one offered at the Official guide problem-133?
from 1)
the set can have any numbers, not necessarily 4
from 2)
All the numbers in the set has to be 4.
Imagine we have a number 1 or 3, then, if this number(1 or 3) is added with 4,4, we will not end up with 12!!
IMO: B
Without analysis, C seemed to be the answer!!
