If y is the smallest positive integer such that 3,150 multiplied by y is the square of an integer, then y must be

When tossed, a certain coin has equal probability of landing on either side.  If the coin is tossed 3 times, what is the probability that it will land on the same side each time?

A certain liquid leaks out of a container at the rate of k liters for every x hours.  If the liquid costs $6 per liter, what is the cost, in dollars, of the amount of the liquid that will leak out in y hours?

Three printing presses, R, S, and T, working together at their respective constant rates, can do a certain printing job in 4 hours.  S and T, working together at their respective constant rates, can do the same job in 5 hours.  How many hours would it take R, working alone at its constant rate, to do the same job?

In isosceles triangle PQR, if the measure of angle P is 80º, which of the following could be the measure of angle R?

I.  20º
II.  50º
III.  80º

A certain list consists of 21 different numbers.  If n is in the list and n is 4 times the average (arithmetic mean) of the other 20 numbers in the list, then n is what fraction of the sum of the 21 numbers in the list?

The average (arithmetic mean) of the 5 positive integers k, m, r, s, and t is 16, and k < m < r < s < t.  If t is 40, what is the greatest possible value of the median of the 5 integers?

Yesterday each of the 35 members of a certain task force spent some time working on project P.  The graph shows the number of hours and the number of members who spent that number of hours working on project P yesterday.  What was the median number of hours that the members of the task force spent working on project P yesterday?

If the sequence x₁, x₂, x₃, …, x_n, … is such that x₁  = 3 and x_n+1 = 2x_n – 1 for n ≥ 1, then x₂₀ – x₁₉ =

In an art gallery, 25 percent of the art pieces on display were photographs.  If 12 percent of the photographs were black-and-white photographs, what percent of the art pieces on display were black-and-white photographs?