A woodcutter desires to make dusters for schools. he plans to make dusters of dimensions 10cm x 4cm x 3cm. How many dusters can be made from a wooden plank of dimensiions 4m x 3m x 1m?

No. of dusters = 400 cm* 300 cm * 100 cm / ( 10 cm * 4 cm * 3 cm)

= 100000 

Ans: 100000 dusters

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a cylinder both side end'internal diametar 11.2cm.and length is21cm. what thickness of tube(assume 22/7)

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