Multiple Choice Question: Which of the following is an integer?

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Orphaned Multiple Choice Questions (MCQ) due to changes of exam system.

In how many ways can 4 couples be seated at a round table with the men and women alternating?
In a class experiment, a student needs 5 liters of 6% solution. He found a 4% and a 10% solution in the laboratory. How many liters of each solution should he mix in order to obtain 5 liters of 6% solution?
Which of the following assets are depreciable?
Amy can walk 4 km in the time it takes Baron to walk 5 km. Amy requires 3 minutes longer than Baron to walk a kilometer. Find the rate of Amy.
In a gambling game a man is paid \$50 if he gets all heads or all tails when 3 coins are tossed, and he pays out \$30 if either 1 or 2 heads show. What is his expected gain?
A line with equation ax + by = 3 passes through (6, 3) and (-1, -1). Find a and b without finding the slope.
Solve for C from the Partial Fraction
An automobile tire is 30 inches in diameter. How fast in rpm does the wheel turn on the axle when the automobile maintains a speed of 50 mph?
A student goes to the library. The probability that she checks out (a) a work of fiction is 0.40, (b) a work of non-fiction is 0.30, and (c) both fiction and non-fiction is 0.20. What is the probability that the student checks out a work of fiction, non-f
The sequence 1, 1, 2, 3, 5, 8, 13 is called the Fibonacci sequence. What is then the tenth term?
At what time between three and four o’clock is the minute hand the same distance from VIII as the hour hand is from XII?
Which of the following states that the deflection at a point on a system due to a force $P$ is equal to the partial derivative of the total strain energy of the system with respect to that force $P$?
Which of the following is an integer?
How many 3-digit numbers greater than 300 can be made out from digits 0, 1, 2, 3, 4, 5, and 6 if repetition of digit is not allowed?
Find the area of the largest rectangle that can be inscribed in a right triangle with legs of length 3 cm and 4 cm if two sides of the rectangle lie along the legs.