algebra

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how do I help my son answer this question/ cary spent 1/3 of his class working on fraction problems and 3/6 of his class working on algebra problems. He spent the last 10 minutes of his class reading a chapter in his textbook. How many minutes long was the entire class? Thank you for your help I did not do good in school and I want him to do better.

let T be the entire class time.

1/3 T + 3/6 T + 10=T

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