3rd and 4th Grade, October, 2022

    A.1425. Every day in Dragon Land the Sun rises at 3:33 and sets at 21:21. How long is the daytime and how long is the nighttime in Dragon Land? A.1426. “How old are you?” Dundy asked the dragon king. This …
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    5th and 6th Grade, October, 2022

    B.1425. Anton and Ben are competing in 50-meter speed walking. They each walk with a constant speed for the whole race. If they start at the same point at the same time, Anton beats Ben by 10 meters at the …
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    7th and 8th Grade, September, 2022

    C.1417. Find all those two-digit numbers that are divisible by both the sum and the product of their digits. C.1418. Three hungry tourists meet at a train station. One of them has 4 bagels, another has 5 bagels, and they …
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    5th and 6th Grade, September, 2022

    B.1417. Using all non-zero digits exactly once, write down 3 numbers so that one of them is three times, the other is five times greater than the smallest number. B.1418. The perimeter of a triangle is 2023 cm. The longest …
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    3rd and 4th Grade, September, 2022

    A.1417. On their trip around the world Fred and Ben saw a beautiful paper dragon in China. The body of the dragon with its head is 740 cm long. Its body is 460 cm longer than its head. How long …
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    3rd and 4th Grade, March, 2022

    A.1409. On their trip around the world Fred and Ben saw a beautiful paper dragon in China. The body of the dragon with its head is 740 cm long. Its body is 460 cm longer than its head. How long …
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    5th and 6th Grade, March, 2022

    B.1409. I have four analog clocks. One of them is 2 minutes fast every hour, another one is 3 minutes late every hour, the third one is always on time, and the fourth clock does not work. One day in …
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    7th and 8th Grade, March, 2022

    C.1409. There are 5 identical circular disks placed on the table as shown below. With a straight line, divide in half the total area of the 5 disks. C.1410. Grandma bought 2 candles. The red is 1 cm longer than …
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