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Answer is 21, but I don’t know the solutions, can anyone help?

Answer is 21, but I don’t know the solutions, can anyone help?
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Answer is 21, but I don’t know the solutions, can anyone help?

Answer is 21, but I don’t know the solutions, can anyone help?-example-1
User Yochi
by
8.0k points

1 Answer

5 votes
In algebra form
P lines per page
120p lines in 120 pages
120p=140(p-3)
120p=140p-420
420=20p
21=p
User Imtiyaz Khalani
by
8.5k points
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