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31.
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Four
usual dice are thrown on the ground. The total of numbers on the top faces of
these four dice is 13 as the top faces showed 4, 3, 1 and 5 respectively.
What is the total of the faces touching the ground?
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A.
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12
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B.
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13
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C.
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15
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D.
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Cannot be determined
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Answer: Option C
Explanation:
In a usual dice, the sum of the numbers on
any two opposite faces is always 7. Thus, 1 is opposite 6, 2 is opposite 5 and
3 is opposite 4.
Consequently, when 4, 3, 1 and 5 are the
numbers on the top faces, then 3, 4, 6 and 2 respectively are the numbers on
the face touching the ground. The total of these numbers = 3 + 4 + 6 + 2 = 15.
