21) F
1 – Correct
Increase from 1955 to 1980 = 60 – 5 = 55 million
Increase from 1980 to 2005 = 228 – 60 =168 million
168 million is more than three times that of 55 million.
2 – Correct
Total number of passengers in Gatwick and Heathrow = 68 + 33 = 101 million passengers
Total number of passengers = 228 million
4 out of 10 means 0.4
0.4 x 228 = 91.2 million
101 million is more than 91.2 million
3 – Correct
Increase predicted by Department of Transport = 500 – 228 = 272 million
Number of years = 2030 – 2010 = 20 years
Increase needed = 272 / 20 = 13.6 million
This more than 10 million per annum.
Since all three statements are correct, F is the answer.