Two flight tickets from Paris to London and one ticket from Paris to Costa Rica costs $77. However, one ticket from Paris to London and two tickets from Paris to Costa Rica cost $73.What are the fares for cities London and Costa Rica from Paris?
Question
Two flight tickets from Paris to London and one ticket from Paris to Costa Rica costs 73.What are the fares for cities London and Costa Rica from Paris?
Solution
Let's denote the cost of a ticket from Paris to London as L and the cost of a ticket from Paris to Costa Rica as C.
From the problem, we have two equations:
2L + C = 77 (equation 1) L + 2C = 73 (equation 2)
We can solve these equations simultaneously to find the values of L and C.
First, let's multiply equation 2 by 2:
2L + 4C = 146
Then, subtract equation 1 from this result:
2L + 4C - (2L + C) = 146 - 77 3C = 69
Divide by 3 to find the cost of a ticket from Paris to Costa Rica:
C = 69 / 3 = $23
Substitute C = 23 into equation 1 to find the cost of a ticket from Paris to London:
2L + 23 = 77 2L = 77 - 23 = 54 L = 54 / 2 = $27
So, the fare from Paris to London is 23.
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