Sruthi:http://i61.tinypic.com/30cannq.jpg\"> please help me with this question.thank you
the number of files at first = n + 280.
the number of notebooks at first = n
after selling,
Files left = 1/4 n + 70
Notebooks = 3/5 n
therefore,
1/4 n + 70 + 3/5 n = 172
5/20 n + 70 + 12/20 n = 172
17 / 20 n = 102
1 / 20 n = 6
20 / 20 n = 120.
the number of files at first = n + 280
120 + 280 = 400
sold = 3/4 of the files
3/4 * 400 = 300.
Hope it helps.
Caden
http://www.elearnwithcaden.blogspot.com