Problema Solution
The Extreme Rock Climbing Club planned a climbing expedition. The total cost was
$1400, which was to be divided equally among the members going. Prior to the trip,
15 members decided not to go. If the cost per person increased by
$21, how many people went on the expedition?
Answer provided by our tutors
Let
x = number of people that were supposed to go to the trip, x>=0
y = price per person initially with x people going
xy = 1400
y = 1400/x
(x-15)*(y+21) = 1400
plug y = 1400/x
(x - 15)(1400/x + 21) = 1400
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click here to see the equation solved for x
........
x = 40 people
x - 15 = 40 - 15 = 25 people went on the expedition.