Question

It was reported that about 80% of airline tickets-nearly $65 billion worth last year are issued over the internet. What were the total sales of airline tickets last year? Round to the nearest billion

Answer 1

The answer is nearly $81 billion.

Explanation:

• If we know that 80% of airline tickets worth $65 billion, then
  `65=80\%\plus{Total_(tickets)}=0.8\plus{Total_(tickets)}\\`.
• Then,to know how much billion dollars worth the total tickets, we just have to clear out
  `Total_(tickets)` of the equation, by dividing both sides by 0.8, which yields
  `(65)/(0.8)=Total_(tickets)=81.25`