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 answer:

a =  15
b =  5

Step-by-step explanation:

$$\begin{gathered} 15+5=20 \\ 20+10=30 \\ a=15=15 \end{gathered}$$

$b=5=5$

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