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AMC 12 2007b Problem 11

  • Paper

The angles of quadrilateral ABCDABCD satisfy ∠A=2∠B=3∠C=4∠D\angle A=2\angle B=3\angle C=4\angle D. What is the degree measure of ∠A\angle A, rounded to the nearest whole number?

(A)125(B)144(C)153(D)173(E)180\mathrm {(A)} 125 \mathrm {(B)} 144 \mathrm {(C)} 153 \mathrm {(D)} 173 \mathrm {(E)} 180

Dataset text AMC 12 2000 to 2025. Quoted with source.

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D

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