Calvin is looking at the ages of 4 Brilliant students. He decides to add them up 3 at a time, and obtains the values 51, 57, 61 and 65. What is the sum of the ages of all 4 of these students?
Details and assumptions
If the ages of the students are 1, 2, 3 and 4, then adding them up 3 at a time will yield 1+2+3=6 , 1+2+4=7 , 1+3+4=8 , 2+3+4=9 .
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