there is no definite answer
there are many even numbers greater than 50, and when you count by 10's, there are still many (but 9/10's less)
since an even number multiplied by an odd number=even and when you count by 10 you are really just multiplying by 10 and 10 is even
any 10 above 50 will work
so the numbers could be
60,70,80,90,100...
