Lying with a straight face...

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One day, Mr and Mrs Tan asked their four children, Benedict, Bob, Brenda and Brian about whether they did their homework. They know that those who did are telling the truth while those who did not are lying.

Benedict: All four of us did our homework.
Bob : Three of us did our homework
Brenda : Two of us did our homework
Brian: One of us did our homework.

The one who is telling the truth is...

Benedict, Bob, Brenda or Brian?

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100 Day Summer Challenge

Lying with a straight face...

Excel in math and science

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Courses

Topics

Community

100 Day Summer Challenge

Lying with a straight face...

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, conceptual quizzes.

Our wiki is made for math and science

Master advanced concepts through explanations, examples, and problems from the community.

Used and loved by 4 million people

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

Master advanced concepts through explanations,
examples, and problems from the community.

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

Master advanced concepts through explanations,
examples, and problems from the community.

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