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Discussion

  1. 195 + 215 is divisible by
    1. Only 10
    2. Only 20
    3. Both 10 and 20
    4. Neither 10 nor 20
  1. Correct Option: C

    We can check divisibility of 195 + 215 by 10 by adding the unit digit of 95 + 15 which is equal to 9 + 1 = 10.
    So it must be divisible by 10.

    Now, for divisibility by 20 we add 19 and 21 which is equal to 40. So, it is clear that it is also divisible by 20.

    So 195 + 215 is divisible by both 10 and 20

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