Question

find the volume of wood used to make a close box of outer dimensions 60cm × 45cm × 32cm , the thickness of wood being 2.5 cm all around.

Answer 1

Answer:
30300 cm³
Step by step explanation :
Volume of the top =lbh=60*45*2.5=6750 cm³
Volume of the bottom =lbh=60*45*2.5=6750 cm³
Volume of the 1st wall=lhh=60*32*2.5=4800 cm³
Volume of the 2nd wall=lhh=60*32*2.5=4800 cm³
Volume of the 3rd wall=bhhh=45*32*2.5=3600 cm³
Volume of the 3rd wall=bhhh=45*32*2.5=3600 cm³
Volume of wood used=(6750*2)+(4800*2)+(3600*2)=13500+9600+7200=30300 cm³
OR
TSA=2(lb+bh+lh)
=2(60(45)+45(32)+60(32))
=2(2700+1440+1920)
=2(6060)
=12120 sq. cm
Volume of wood used=TSA*2.5=12120*2.5=30300 cm³