Nadia walked 18 kilometers, which was twice as far as Hannah walked. How many kilometers did the two girls walk in total? Let's think step by step and output the final answer after "####".
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Hannah = (1/2) 18 = 9
9 + 18 = <<9+18=27>>27 km
Together they walked 27 kilometers.
#### 27
Nadia walked 18 kilometers, which was twice as far as Hannah walked. How many kilometers did the two girls walk in total?
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