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The diagonal lines join a vertex to the midpoint of the edge.
What fraction of the regular hexagon is shaded?
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5 years ago, the ratio of a father's and his son's ages was 3:1.
15 years from now, the ratio will be 2:1.
What is the father's current age?
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I have 3 nickels, 2 dimes, 2 quarters, and 2 half-dollars in my pocket.
If I randomly pull out 4 coins simultaneously, what's the probability that exactly 2 nickels are included?
Note: Nickels, dimes, quarters, and half-dollars are all American coins.
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If a,b, and c are distinct numbers, is it possible that
a+2b<b+2c<c+2a?
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You have an empty notebook with 96 sheets. Each sheet is numbered on both sides, with the page numbers ranging from 1 to 192 (inclusive).
Is it possible to rip out 25 sheets such that the sum of the page numbers on these sheets is exactly 1990?
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