Question

A closed box is made up of wood which is 1 cm thick.the outer dimensions of the box is 5cm*4cm*7cm. find the volume of the wood used?​

Answer 1

Answer:

110cm^3

Step-by-step explanation:

Given outer length =5 cm

Outer breadth =4 cm

Outer height =7 cm

Outer volume = length × breadth × height

=5×4×7=140cm^3

Thickness of wooden box, w=1 cm

Inner length =l–2w=5–2=3 cm

Inner breadth =b–2w=4–2=2 cm

Inner height =h–2w=7–2=5 cm

Inner volume =3×2×5=30cm^3

Volume of wood used = outer volume – inner volume

=140−30=110cm^3