Question

find the volume of wood required to make a closed box of external dimensions 80cm ,75cm and 60cm , the thickness of walls of the box being 2cm throughout

Answer 1

L= 80 cm
B = 75 cm
H = 60 cm
T (thickness) = 2cm
L' = 80-4= 76cm     (2 is subtracted from either end)
B' = 75-4 = 71 cm
H'= 60 - 4 = 56 cm
Volume of wood
= Volume of outer box - Volume of inner box
= L×B×H - L'×B'×H'
=(80×75×60)cm³ - (76×71×56)cm³
=360000cm³ - 302176cm³
= 57824cm³

Answer 2

Answer:

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Step-by-step explanation:

L= 80 cm

B = 75 cm

H = 60 cm

T (thickness) = 2cm

L' = 80-4= 76cm     (2 is subtracted from either end)

B' = 75-4 = 71 cm

H'= 60 - 4 = 56 cm

Volume of wood

= Volume of outer box - Volume of inner box

= L×B×H - L'×B'×H'

=(80×75×60)cm³ - (76×71×56)cm³

=360000cm³ - 302176cm³

= 57824cm³