Question
Zoe bought a total of 75 big and small chocolate bars. Then she decided to exchange 50% of her big chocolate bars for the small ones in the ratio of 1 : 5. After the exchange, she had 87 chocolate bars. What percentage of the chocolate bars she bought were small ones?
5 m

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Zoe bought a total of 75 big and small chocolate bars. Then she decided to exchange 50% of her big chocolate bars for the small ones in the ratio of 1 : 5. After the exchange, she had 87 chocolate bars. What percentage of the chocolate bars she bought were small ones?