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