Okay this question is hard ! A rectangular prism is truncated removing 30% of its height. The original height of the prism was 100 cm and it has a length of 6 cm and a width of 12 cm. What is the volume of the truncated prism?

a.2,160 cm3
b.3,160 cm3
c.4,040 cm3
d.5,040 cm3

Question

Okay this question is hard ! A rectangular prism is truncated removing 30% of its height.  The original height of the prism was 100 cm and it has a length of 6 cm and a width of 12 cm.  What is the volume of the truncated prism?

a.2,160 cm3
b.3,160 cm3
c.4,040 cm3
d.5,040 cm3

anonymous · Answer

what's the height of the prism if it was originally 100 and has been reduced by 30%?

anonymous · Answer

you want me to subtract that ???

anonymous · Answer

yes

anonymous · Answer

70

anonymous · Answer

yeah, because 30% of 100=30

anonymous · Answer

so now use this as your height, and calculate the volume using the other given dimensions

anonymous · Answer

do you know how to calculate the volume of a rectangular box?

anonymous · Answer

LxW right ?

anonymous · Answer

L*W*H

anonymous · Answer

L*W would give you the area of a rectangle.  you need the height in there to get the volume

anonymous · Answer

so, what am i multiplying ?

anonymous · Answer

the length, the width and the height

anonymous · Answer

i know, but you want me to do 100x6x12 ??? it came up to 7200 :( im so confused on this one.

anonymous · Answer

no, the height is not 100, remember?

anonymous · Answer

oh yeah .. 30 ?

anonymous · Answer

no, the height of 100 has been reduced by 30

anonymous · Answer

okay , i did 70x6x12 and i got D.5040 :) !

anonymous · Answer

:)