[ Answer ]
1380
[ Explanation ]
57 1/2 * (72 / 3)
72 / 3 = 24
57 1/2 * 24
Turn 57 1/2 into improper fraction:
115 / 2
115/2 * 24/1
Multiply across:
115 * 24
2 * 1
= 2760 / 2
= 1380
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