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  1. Step by Step Solution : 

    Let, total family be x
    Therefore,
    Times of India, 
    = x × 65/100
    = 13x/20
    Indian Express,
    = x × 75/100
    = 3x/4
    Neither,
    = x × 15/100
    = 3x/20
    Therefore,
    = x – 3x/20
    = 20x – 3x/20
    = 17x/20

    Now total families lived in that locality, 
    = 13x/20 + 3x/4 + 3x/20 = x 330
    = 13x + 15x 3x/20 = x + 330
    = 31x/20 = x + 330
    = 31x = 20x + 6600
    = 31x – 20x = 6600
    = 11x = 660
    = x = 6600/11
    = x = 600
    So, a total of 600 families live in that locality.

    Video Explanation : 
    https://youtu.be/S89fqEzf4J4

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