Each coat rack has 2 umbrellas.
How many umbrellas are on 6 coat racks?
| Number of coat racks | Number of umbrellas |
| 1 | 2 |
| 2 | 4 |
| 3 | 6 |
| 4 | 8 |
| 5 | 10 |
| 6 | ? |
umbrellas
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