If we have a three digit number abc and if c is even then it becomes an even number. Even numbers are those numbers which end with a digit like 0,2,4,6,8.
as c is an even number, it can be any number among 0,2,4,6,8.When c is 0 only in that case abc will be divisible by 5. Only those numbers are divisible by 5 whose units digit is either 0 or 5(test of divisibility by 5).
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