Question 404768
The cost of a bus excursion was $180. This amount was to have been shared equally by all those who said they wished to go. 
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Let that number of people be "x".
The average cost per person is 180/x dollars.
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However, 6 people failed to show up so that those who did go each had to pay $1.50 more. 
Now the number of people is "x-6".
Now the average cost per person is 180/(x-6) dollars.
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How many people actually went on the trip?
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Solve: new average - old average = 1.50 dollars 
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Cheers,
Stan H.