Solve each of the following variation problems by setting up a
formula to express the relationship, finding the constant, and then
answering the question.
The number of lottery tickets sold varies directly varies di-
rectly as the value of the prize. If 200 tickets are sold for a
prize worth $1000, how many tickets will be sold when the
prize is worth $1500?
The number of lottery tickets sold varies inversely as the
price of the tickets. If 200 tickets are sold when the price is
$5 per ticket, how many tickets will be sold if the price per
ticket is $4?
The time required to build a fence varies inversely as the
number of workers assigned to the project. If three workers
can complete the fence is 18 days, how long would it take
two workers to complete the job?
The number of gallons of gas used by a car (driving along
the road at a constant speed) varies jointly as the distance
traveled and the square of the speed. If four gallons are used
to drive 100 miles at 75mph, how many gallons would be
used to drive 40 miles at 60mph?
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