SOLUTION: The cost of chartering a bus for the ski club's annual winter ski trip was split evenly by the 20 students planning to go. The day before the trip, 10 more students decided to go.

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Question 1148898: The cost of chartering a bus for the ski club's annual winter ski trip was split evenly by the 20 students planning to go. The day before the trip, 10 more students decided to go. Dividing the cost evenly among all 30 students brought the average cost down by $9.00 per person. What was the total cost of chartering the bus?
Answer by ikleyn(52797) About Me  (Show Source):
You can put this solution on YOUR website!
.

Let " T " be the total cost, in dollars.


Then from the condition, you have this equation


    T%2F20 - T%2F30 = 9  dollars.


It is direct and literal translation of the condition to Math.


To solve the equation, multiply both its sides by 60. You will get


    3T - 2T = 9*60,   or


    T       = 540  dollars.    ANSWER

Solved.