Despite piles of evidence showing that insecticides in tropical rice cultivation were ineffective, it still remains the dominant pest-control tactic.

Denver, Colorado, which devoted $1 billion to the commercial development of its downtown, now it is investing $1 billion additionally in downtown residential construction, building more than 1,000 apartments within the next year, more than have been constructed over the last four years.

A certain online form requires a 2-digit code for the day of the month to be entered into one of its fields, such as 04 for the 4th day of the month. The code is valid if it is 01, 02, 03,...,31 and not valid otherwise. The transpose of a code xy is yx. For example, 40 is the transpose of 04. If N is the number of valid codes having a transpose that is not valid what is the value of N?

A computer can perform 1,000,000 calculations per second. At this rate, how many hours will it take this computer to perform the 3.6 x 10¹¹ calculations required to solve a certain problems?

1,234

1,243

1,324

........

........

+4,321

The addition problem above shows four of the 24 different integers that can be formed by using each of the digits 1, 2, 3, and 4 exactly once in each integer. What is the sum of these 24 integers?

In an auditorium, 360 chairs are to be set up in a rectangular arrangement with x rows c exactly y chairs each. If the only other restriction is that 10 < x < 25, how many different rectangular arrangements are possible?

When the integer n is divided by 17, the quotient is x and the remainder is 5. When n is divided by 23, the quotient is y and the remainder is 14. Which of the following is true?

A factory assembles Product X from three components, A, B, and C. One of each component is needed for each Product X and all three components must be available when assembly of each Product X starts. It takes two days to assemble one Product X. Assembly of each Product X starts at the beginning of one day and is finished at the end of the next day.The factory can work on at most five Product Xs at once. If components are available each day as shown in the table above, what is the largest number of product Xs that can be assembled during the three days covered by the table?

Which of the following describes the set of all possible values of the positive integer k such that, for each positive odd integer n, the value of ~$n \over k$~ is midway between consecutive integers?

The table above shows the number of residents in each of two age groups who support the use of each type of funding for a city initiative. What is the probability that a person randomly selected from among the 250 residents polled is younger than 40, or supports a type of funding that incudes a tax, or both?