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Children at the party.

Algebra Level 2

Each child of a group gives a gift to other children. Total number of gifts are 110. Then find the number of children in the group.

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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 5 million people

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including olympiad champions, researchers, and professionals.

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by Dinesh Nath Goswami

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