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Everything Is Proportional

Algebra Level 1

If it takes 3 men to build 3 houses in 3 months,
then how long it takes 1 man to build 1 house?

1 month 2 months 3 months

View solutions

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 Pi Han Goh

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