Since there are five numbers in that group, the
mean (average) of the group is 1/5 of their sum.
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23/20 = 13/20
There are an infinite number of sets-of-4 that all have a mean of 12. Here are a few of them : 12, 12, 12, and 12 10, 11, 12, and 15 5, 10, 15, and 18 5, 7, 13, and 23 -12, 10, 20, and 30 1, 2, 3, and 42
13/20 = 23/20
4/20 + 2/13 = 92/260 or 23/65
It is: 15