Answers

2015-12-24T22:41:40+05:30
Volume of planks= 5x25x10=1250 cm²
volume of pit= 20x(6x100)x50=600000cm²
no. of planks= volume of pit/ volume of plank
=600000/1250
=480 planks
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2015-12-24T23:15:31+05:30
No.of Planks = Vol. of pit/ Vol.of one plank.

Vol.of one plank= 5 m*25 cm*10 cm= 500 cm*25 cm*10 cm= 125000 cubic.cm.
Vol.of pit= 20 m*6 m*50 cm=2000 cm*600 cm*50 cm= 60000000 cubic.cm.

No.of Planks= 60000000/125000
= 480 planks.

Hope this help you. :)
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