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The difference between the prices of a coach ticket and a first class ticket is $135. If the first class ticket is 175% of the cost of a coach ticket what is the cost of the coach ticket?
Let x = cost of a coach ticket
(x+135) = cost of 1st class ticket
Change 175% to decimal, namely, 1.75:
1.75x = x + 135
1.75x - x = 135
.75x = 135
x = $180 is the coach fare