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Problem 390

Number theory Difficulty 2.0 Find the answer UKMT Junior Mathematical Challenge · United Kingdom · 2026

In Poppy’s pond there are frogs and snakes. Four-fifths of the frogs are green frogs and six-sevenths of the snakes are black snakes. Which of the following could not be the total number of creatures in Poppy’s pond?

(A) $22$ (B) $23$ (C) $24$ (D) $26$ (E) $27$

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