How to change the value of a cell depending on another cell

I have a task, on a dropping list I have 3 row, each row according a value in another cell which should be change, example:

Dropping list on a b9 cell contains value a1,a2,a3

In a cell e9 I want to input automatically 10, 20 or 30, if

a1=10, b2=20, a3=30

Answers

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