10 - 11 year olds

Helen and Cristina are writing three-digit numbers. In each number, their digits must be different. In addition, each one of them, adds the following condition to the previous conditions:

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a- Helen writes even numbers, using 2 or 3 or 5 or 7 as digits.

b- Cristina writes multiples of 5 using 0, 2 or 3 or 5 as digits.

How many numbers did each girl write?