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Algebra Difficulty 3.0 AMC 10/12 Find the answer United Kingdom

In a school, one fifth of the students have blue eyes. One tenth of the left-handed students have blue eyes. One quarter of the right-handed students have blue eyes. What fraction of the students are left-handed?

(A) $\dfrac{1}{3}$ (B) $\dfrac{1}{4}$ (C) $\dfrac{1}{5}$ (D) $\dfrac{1}{8}$ (E) $\dfrac{1}{10}$

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