math
posted by hasan .
in a town there are 1600 phones out of which 3/4 are dial phones 1/3 of those dial phones are replaced by touchtone phones and 300 additional touch tone phones are installed. the fraction representing the touch tone phones in town is:
(a) 7/19 (b) 11/19

3/4 * 1600 = 1200 Dial phones.
1/3 * 1200 = 400 Replaced by touchtones.
400 + 300 = 700 = Total touchtone phones.
700/(1600+300) = 700/1900 = 7/19 = a.
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