exam Maths Puzzle Numerical Ability

x-6=6/4

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exam Other Question

When x number of units are sold, the price of each unit (in dollars) is given by p= -x/2 + 75. Find the unit price when the following quantities are sold. 2, 7, 9, 11. A bookstore offers wireless Internet access to itscustomers for a charge.The cost is $1.50+m over 20,m=# of minutes.
How much would it be for 40 minutes?