5 exercises · 5 automatically checked · Untimed
5 questions · Shuffled order · Untimed practice
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A delivery service charges $14 plus $3 per package. A 5% surcharge applies to the entire subtotal, and the final charge is $77.70. How many packages were delivered?
Enter an integer, decimal or fraction without units. Use up to 5 characters, or 6 including a leading minus.
20 packages
The surcharge multiplier applies to the entire subtotal, so 1.05(14 + 3n)
An equal-weight data set has five values with mean 18. A sixth value is added, making the mean 20. What is the sixth value?
Enter an integer, decimal or fraction without units. Use up to 5 characters, or 6 including a leading minus.
30
The original five values total 5(18)
A runner covers 6 miles at 6 miles per hour and returns along the same route at 4 miles per hour. There are no stops. What is the average speed, in miles per hour, for the whole run?
Enter an integer, decimal or fraction without units. Use up to 5 characters, or 6 including a leading minus.
4.8 miles per hour
The total distance is 12 miles. The first 6 miles take 6/6
A 30-liter mixture is 40% juice by volume. Water is added, with no mixture removed and additive volumes, until the mixture is 25% juice. How many liters of water were added?
Enter an integer, decimal or fraction without units. Use up to 5 characters, or 6 including a leading minus.
18 liters
The amount of juice is fixed at 0.40(30)
Two adjacent rectangular pens share a wall along one long side. There are three equal perpendicular fence segments and one long parallel fence. Exactly 60 meters of fencing is used. What is the maximum possible total area, in square meters?
Enter an integer, decimal or fraction without units. Use up to 5 characters, or 6 including a leading minus.
300 square meters
Two pens against a wall require one parallel length L and three perpendicular widths w, so L + 3w
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