Last year, Xiaohong’s family sold their own turf at 7.5 yuan per square meter, earning 540 yuan. How many square meters of turf did Xiaohong’s family sell last year?
小红家去年售出自家种植的草皮，每平方米7.5元，收入540元，小红家去年出售了多少平方米的草皮？
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