Sum and rounding

I know two numbers whose sum is 20. When they each round and then added together I get the 30. What are this numbers?

Correct result:

a =  15
b =  5

Solution:

15+5=20 20+10=30 a=1515+5=20 \ \\ 20+10=30 \ \\ a=15
b=5b=5

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