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    Question

    ∠A, ∠B, and∠C are three angles of ∆ABC.if

    ∠A-∠B=15°, ∠B-∠C =30°,then ∠ A, ∠B and ∠C are?
    A 70°,55°,55° Correct Answer Incorrect Answer
    B 80°,65°,35° Correct Answer Incorrect Answer
    C 80°,65°,35° Correct Answer Incorrect Answer
    D 80°,60°,40° Correct Answer Incorrect Answer

    Solution

     ∠A-∠ B=15° ∠ B-∠ C=30° As we know that  ∠A+∠ B+∠ C=180° =15°+∠ B+∠ B+∠ B-30° =180° =3∠B=180°+15°=195° =>∠B=195/3=65°, = ∠A=80° ∠C=35°

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