19) 217

Total number of air passengers in 2005 = 228 million

The text says that 9 in 10 passengers were international. So 1 in 10 must be domestic. 
Number of domestic passengers = 0.1 x 228 = 22.8 million passengers.
Since each domestic passenger was counted twice, we need to divide 22.8 by 2. 

So number of domestic passengers = 22.8 / 2 = 11.4 million.

Total number of passengers (international + domestic) =  (228 – 22.8) + 11.4 =  216.6 million

To the nearest million, this is 217 million

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