250 m2
7:3 - proporcje
7+3=10
250*7/10=175m2
250*3/10=75m2
175m2-75m2=100m2
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Verified answer
250 m2
7:3 - proporcje
7+3=10
250*7/10=175m2
250*3/10=75m2
175m2-75m2=100m2