algebra

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In triangle ABC, the size of angle B is 5 times the size of angle A, and the size of Angle c is 15 degrees less than 4 times the size of angle A. What is the size of angle A? What is the size of angle B? What is the size of angle C?

  • algebra -

    A+B+C = 180 for a triangle ABC

    B = 5A
    C = 4A-15

    A + 5A + 4A - 15 = 180
    10A = 195
    A = 19.5
    B = 97.5
    C = 63

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