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Basketball

Level 1

David went to the nearby park to shoot some free-throws. He shot 75 times and made 68% of them. How many free-throws did David make?

50 48 51 65

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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

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including olympiad champions, researchers, and professionals.

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by Vishal Srinivasan

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