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1 December, 09:19

How many positive integers less than 2018 are divisible by 20 or by 25, but not by both?

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  1. 1 December, 09:37
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    160

    Step-by-step explanation:

    Divisible by both 20 and 25:

    Divisible by 100

    2018/20 = 100.9

    100 multiples of 20

    2018/25 = 80.72

    80 multiples of 25

    2018/100 = 20.18

    20 multiples of 100

    Union: 100 + 80 - 20

    160
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