Question

A box lid is made iut if 2 cm thick wood. Its external length, breadth & height are 25cm, 18cm, 15cm, respectively. Find the capacity of box & volume of wood used

Answer 1

For box
external length=25cm
external breadth=18cm
external height=15cm
So,external volume=(25×18×15)cm^3=6750cm^3
since,thickness=2cm
so,internal length=25-(2×2)=21cm
internal breadth=18-(2×2)=14cm
internal height=15-(2×2)=11cm
So,internal volume=(21×14×11)cm^3=3234cm^3
1)so,capacity of box=3234/100×100×100×1000l=3.234 litre
2)And volume of wood=External volume-Internal volume
=6750-3234cm^3=3516cm^3