5. A carpenter cuts a 3m long plank into pieces 30mm each, how many pieces did he get from the plank?
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0
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Step-by-step explanation:
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Answered by
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Let x be the original length of the plank.
length of plank cut by carpenter first time is
12
5
x
length of plank after the first cut is x−
12
5
x=
12
7
x
length of plank cut by carpenter after second time is
12
7
×
7
6
x
=
12
6
x
Remaining piece =original- cutting part
⇒x−(
12
5
x+
12
6
x)=
2
5
⇒x−
12
11
x=
2
5
x=30m
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