50% of major airline companies equip their planes with wireless internet access. 70% of major airlines offer passengers free on-board snacks. What is the greatest possible percentage of major airline companies that offer both wireless internet and free on-board snacks?
Choose the most appropriate option:
A) 20%  B) 30%  C) 40%  D) 50%  E) 70%
To maximize the percentage of companies offering both, let's assume that all 50% of companies which offer wireless internet also offer snacks.   The answer is 50%.
<result>D</result>
50% of major airline companies equip their planes with wireless internet access. 70% of major airlines offer passengers free on-board snacks. What is the greatest possible percentage of major airline companies that offer both wireless internet and free on-board snacks?