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The “interlock” of two sets is defined as the

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5. The “interlock” of two sets is defined as the average (arithmetic mean) of the elements that are common to both sets. If set M contains 12 consecutive integers, the greatest of which is 18, and set N contains 17 consecutive integers, the greatest of which is 30, what is the value of the interlock of sets M and N?

I got lost in computing for the interlock
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New post 19 Dec 2004, 19:11
M={7,8,...18}
N={14,15,...30}
common elements= 14,...18
Avg = 16
  [#permalink] 19 Dec 2004, 19:11
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