Question:
Zoe baked some chocolate cookies and gave half of them to Mabel. Mabel baked some butter cookies and gave half of them to Zoe. Zoe ate 5 butter cookies and the ratio of the number of chocolate cookies to the number of butter cookies she had left became 4 : 1. Mabel ate 3 chocolate cookies and the ratio of the number of chocolate cookies she had left to the number of butter cookies became 3 : 1.
(a) Were there more chocolate cookies or butter cookies at first?
(b) How many chocolate cookies did Zoe bake?
Solution:
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