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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.

NAVY TRUE Portland S FILA low
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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?

NAVY low S FILA TRUE Portland

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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.

TRUE Portland S FILA NAVY low 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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Portland S TRUE NAVY FILA low 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 Portland S TRUE FILA NAVY low TRUE S Portland FILA low NAVY Pi Han Goh

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Portland NAVY S FILA TRUE low xAUqZX1 Portland NAVY S FILA TRUE low xAUqZX1 Portland NAVY S FILA TRUE low xAUqZX1 Portland NAVY S FILA TRUE low xAUqZX1 Portland NAVY S FILA TRUE low xAUqZX1 Portland NAVY S FILA TRUE low xAUqZX1 Portland NAVY S FILA TRUE low xAUqZX1 Portland NAVY S FILA TRUE low xAUqZX1
Product type Trainers
Ref. 177167
Season Spring/Summer
Width Standard
Manufacture China
Construction Vulcanized
Size reference 42
Colour Blue
Lining Textile
Upper/Ankle Nubuck
Sole type Removable inner sole
Insole Textile
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