20 [20x3 { 20 3 ½ t (40x3) }]
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Answer:
USE BOARD MASS RULE OVER HERE
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Answer:
20[20*3{20 31/2t(40*3)}]
=20[20*3{20 31/2t*120}]
=20[20*3*3600]
=20*216000
=4320000
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