A beam is 9 metre long 40 cm wide and 20 cm is made up of iron which weighs 50 kg per cubic metre. the weight of beam is what?
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900/20=45cm
now 20 cm =50kg/m^3
so 1cm=50/20
=2.5kg
there fore beam weighs =2.5×900=2250
now 20 cm =50kg/m^3
so 1cm=50/20
=2.5kg
there fore beam weighs =2.5×900=2250
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