heids17043 heids17043

24-11-2018
Mathematics

contestada

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

Answer is 21 but I dont know the solutions can anyone help class=

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salatulmaghrib salatulmaghrib

24-11-2018

In algebra form
P lines per page
120p lines in 120 pages
120p=140(p-3)
120p=140p-420
420=20p
21=p

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