how much is a coach ticket

Question

the difference between the prices of a first-class airline ticket and a coach ticket is $135. The cost of a first-class ticket is 175% of a coach ticket. What is the cost of a coach ticket? 

Answer 1

Let f = cost of first class

Let c = cost of coach

 

f - c = 135

f = 1.75c

 

1.75c - c = 135

0.75c = 135

c = 135/0.75

c = $180 for a coach ticket