Filter on two conditions

Hi guys,

I want to filter a table by two values.

Suppose I have this schema:

Date  A

1/1    12

2/1    15

3/1    12

I want to remove rows in which (A < 15 AND the date is older than 3 days ago.) If it's less then 3 days ago, keep it, no matter what the value of A is.

What would you say is the best way to accomplish this?

Thanks!