SOLUTION: HELP A teacher of a class of 12 shakes hands with all of his students as well as their parents and grandparents. If everyone in his class has both of their parents alive and on

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Question 1089873: HELP
A teacher of a class of 12 shakes hands with all of his students as well as their parents and grandparents. If everyone in his class has both of their parents alive and on average 3 out of their 4 grandparents alive, how many hands does the teacher shake?
Answer by addingup(3677) About Me  (Show Source):
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12 + (12*2) + (12*3) = 72