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Excel in math and science

Master concepts by solving fun, challenging problems.

It's hard to learn from lectures and videos

Learn more effectively through short, interactive explorations.

Used and loved by over 6 million people

Learn from a vibrant community of students and enthusiasts,
including olympiad champions, researchers, and professionals.

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Marie shops at a store where all prices end in 99 cents ($0.99, $1.99, $2.99, etc.). She ends up spending $33.89.

How many items did she purchase?

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by Victor Paes Plinio

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Measuring sticks of various lengths are hinged at the edge of a table, with a fingertip supporting the stick somewhere along the stick's length.

When is the force applied by the fingertip the greatest?

Details and Assumptions:

  • All measuring sticks are made of the same material and have the same width and thickness.
  • All measuring sticks are divided into segments.
by Rohit Gupta

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These images show the same part of the night sky as seen in January and July 2018. Most of the stars have remained fixed, though two seem to have moved relative to the others.

Sting Marine Sting Minions Minions Minions Marine Sting Sting Minions Marine Minions Marine Sting Marine Which star is closer to us, red or blue?

Assume that the red and blue stars have not moved significantly relative to the Sun in the time between the two images were taken.

by Pranshu Gaba

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Marine Minions Marine Marine Sting Sting Minions Sting Minions Marine Sting Minions Minions Sting Marine Out of a group of students, 60% are taking mathematics, 65% French, and 75% German, but none are taking all 3 subjects.

Is there a student who is taking neither French nor German?

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are integers satisfying One possible solution is

How many other solutions are there?

by Marine Marine Sting Sting Sting Marine Minions Minions Marine Minions Sting Minions Sting Marine Minions Minions Sting Marine Marine Sting Sting Minions Minions Marine Sting Marine Minions Sting Marine Minions Pi Han Goh

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Product type Slippers
Ref. 160260
Season Fall/Winter
Manufacture China
Construction Injected
Size reference 34
Colour Blue
Heel height 1 cm
Lining Textile
Upper/Ankle Textile
Insole Textile
Outer sole Synthetics
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