Hammond’s statues weighed 80 - 22 = <<80-22=58>>58 pounds after the discarded marble was carved off.
Minus the first statue, the statues weighed 58 - 10 = <<58-10=48>>48 pounds.
Minus the second statue, the statues weighed 48 - 18 = <<48-18=30>>30 pounds.
The remaining two statues weighed the same amount, so each weighed 30 / 2 = <<30/2=15>>15 pounds.
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