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Algebra Difficulty 1.0 Junior Find the answer United Kingdom

When Ellen went to the shop, she found she could spend all her money on 6 cans of cola and 7 croissants or on 8 cans of cola and 4 croissants. If she decided to buy only croissants, how many croissants could she buy?

(A) $12$ (B) $13$ (C) $15$ (D) $16$ (E) $25$

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