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in a town there are 1600 phones out of which 3/4 are dial phones 1/3 of those dial phones are replaced by touch-tone 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

  • math -

    3/4 * 1600 = 1200 Dial phones.

    1/3 * 1200 = 400 Replaced by touch-tones.

    400 + 300 = 700 = Total touch-tone phones.

    700/(1600+300) = 700/1900 = 7/19 = a.

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