Monday 8th April 2024
Difficulty: Hard
Puzzles II (Quiz #507)
Photo by Jack Hamilton (Unsplash)
1. A frog at the bottom of a well climbs up 3 metres every day, but slips back 2 metres during the night. How long will she take to reach the top, if the well is 20 metres deep?
2. What hour (summer time) is the same distance before midnight (GMT) as three o'clock (summer time) is after midnight (GMT)?
3. You have three bags, each of which contains two marbles. Bag A contains two white marbles; bag B contains two black marbles; and bag C contains one white marble and one black marble. You pick a random bag and take out one marble, which is white. What is the probability that the other marble from the same bag is also white?
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