# Elevator

The panel house has ten over-ground stories and four underground. The lift goes from the ground floor to the 2nd floor, then down to the 3rd underground floor, nine floors up, and finally four floors down. To what floor elevator arrive? How many floors did it pass over?

a =  2
b =  20

### Step-by-step explanation:

$a=-3+9-4=2$
$b=0+2+\left(2+3\right)+9+4=20$

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