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Question
Six dice are stacked on the floor as shown in the figure below. On each dice, the sum of numbers on opposite faces is 7, i.e., if 1 is written on one face then 6 is written on the face opposite it and so on.
What is the maximum possible sum of numbers on the 21 visible faces?
Options
88
89
96
147
Solution
89
Explanation:
Pair of numbers on opposite faces of the dice = (1 - 6), (2 - 5), (3 - 4)
To get maximum on visible faces, we should have the least value on invisible faces sum of the number on visible faces on top-placed dice
= 2 + 3 + 4 + 5 + 6 = 20
Sum of numbers on visible faces on middle row dice
= (6 + 5 + 2) + (6 + 4 + 4 + 3) = 31
Sum of numbers on visible faces on bottom row dice
= (6 + 5 +2) + (6 + 1) + (6 + 5 + 3 +4) = 38
Hence, total sum = 20 + 31 + 38 = 89
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