Question 1160464
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To get the volume of a box, we multiply the length width and height. I'll treat "2 & 1/2" as 2.5


A = old volume = 3*6*12 = 18*12 = 216 cubic inches
B = new volume = 2.5*5*10 = 12.5*10 = 125 cubic inches
C = difference in volumes = A - B = 216 - 125 = 91


<font color=red>The volume is reduced by 91 cubic inches.</font>
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