Answer:
110/170 = 0.6471 = 64.7% or 65%
Step-by-step explanation:
               reading |  television
Television      |   70     |   20     |     90 total for TV
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Reading       |   40     |   40     |    80 total for reading
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Total students  |   110     |    60    |     170 total students
Students who like BOTH are 70 + 40 = 110 Â percentage = part/whole = 110/170
Students who ONLY like television = 20
Students who ONLY like reading = 40