A tank contains 1,000 gallons of a solution that is 6 percent salt by volume. If 200 gallons of water evaporate from the tank, the remaining solution will be approximately what percent salt?

In a courtyard, one bell rings every  hour and another bell rings every hour. Both bells ring together at exactly the beginning of each hour. Which of the following gives all of the intervals that occur between any two rings of the bells, in minutes?

What is the largest integer k for which ${81}^k<3^{27}$?

If 60 percent of a class answered the first question on a certain test correctly, 60 percent answered the second question on the test correctly, and 60 percent answered both questions correctly, what percent answered neither question correctly?

If two 2-digit positive integers have their respective tens digits exchanged, the difference between the pair of integers changes by 4. What is the greatest possible difference between the original pair of integers?

A student's average (arithmetic mean) test score on 4 tests is 68. What must be the student's score on a 5th test for the student's average score on the 5 tests to be 70?

If , which of the following must decrease as decreases?

I.

II.

III.

The ratio of the height of a regular cylindrical container to the radius of its base is approximately 4.3 to 3. If the radius of the base is 6 meters, what is the approximate height of the container, in meters?

If  is an integer, which of the following cannot be odd?

The diagram above shows the path of a projectile fired from raised platform A at a target at point C, which lies 100 feet from the base of the platform. The projectile fell short, impacting at point B. If AB = 90 feet, by what distance, in feet, did the projectile fall short of its target?

${\left(\frac{x+1}{x-1}\right)}^2$

If $x>1$, and if $x=\frac{1}{y}$, then the expression above is equivalent to

A bar over a sequence of digits in a decimal indicates that the sequence repeats indefinitely. What is the value of $0.00\overline{16}$ divided by $0.\overline{04}$?

The pre-tax price of a certain item was . If the tax added to the purchase was more than percent but less than percent of the pre-tax price, then the total amount paid, including tax, could have been

The author would be most likely to agree with which of the following statements?

The passage suggests which of the following about determining whether one species blocks another out of an area?

According to the passage, the primary reason that thermal denaturation and reassociation gives information about the genetic diversity in a soil sample is that

It can be inferred from the passage that which of the following would most probably be one major difference in behavior between a "presumed expert," as mentioned in the highlighted text, and a true expert?

The author cites the existence of constraints on contract against usury in order to do which of the following?

According to the passage, which of the following was true of the ruling on the case Lochner v. New York?

The author is primarily concerned with