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UKMT Junior Kangaroo, 2018

Number theory Difficulty 3.0 AMC 10/12 Find the answer United Kingdom

In the sum $KAN + GA = ROO$ each letter stands for a different digit. What is the answer to the subtraction $RN - KG$ ?

(A) $10$ (B) $11$ (C) $12$ (D) $21$ (E) $22$

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