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Each of three tall buildings has a light that flashes on its roof to warn low-flying aircraft. One light flashes every 3 seconds, another light flashes every 4 seconds, and the third light flashes every 6 seconds. If the three lights flash at precisely the same moment, what is the least number of seconds after which the three lights will flash again at the same moment?
Then are between 40 and 70 members in a certain club. If 1 member is absent then the remaining members can be divided into groups of 4 members each with no members left over. If 2 members are absent, then the remaining members can be divided into groups of 5 members each with no members left over. How many members are in the club?
Last month in Company X, the ratio of the amount of money spent by the production department to the amount spent by the research department was 5 to 2, and the ratio of the amount of money spent by the sales department to the amount spent by the production department was 3 to 5. Last month the sales department spent s dollars.

Quantity A

The amount of money spent by the research department last month in Company X

Quantity B

$$\frac{2s}{3}$$ dollars


Which of the following is closest to the percent increase in the total school enrolment from 1990 to 2000?
For the high school enrollment in 2000, which of the following is closest to the ratio of the enrollment of population group $$A$$ to the sum of the enrollments of population groups $$B$$ and $$C$$?
Two students are to be selected at random at the same time from the total school enrollment in 1960. Which of the following is closest to the probability that both students will be students who were enrolled in high school in 1960?
For which of the following pairs of years did the ratio of total donations from individuals to total donations from organizations for one of the years exceed that for the other year by the greatest amount?
For how many of the years from 2007 to 2010 were the total donations from individual and the total donations from organizations in that year each greater than the corresponding total donations in the preceding year?
If the average (arithmetic mean) of the total donations from individuals for the years from 2008 to 2012 was $343,000, what was the average of the total donations from individuals for the years 2011 and 2012? $______ thousand
For the respondents who rated their degree of confidence in state government high or moderate, the ratio of the number who gave a rating of high to the number who gave a rating of moderate was $$1$$ to $$3$$. How many of the respondents rated their degree of confidence in state government high?
If $$20$$ percent of the respondents rated both their degree of confidence in the federal government and their degree of confidence in the news media high or moderate, what percent of the respondents gave neither of these institutions a confidence rating of high or moderate?
Of the respondents who did not rate their degree of confidence in the federal government undecided, approximately what fraction rated their degree of confidence in that institution little or none?
For people surveyed who are in the age-group 25-34 years, which of the following is closest to the ratio of the number of people who have $$5$$ or more servings of fruits and vegetables per day to the number of people who have $$4$$ or fewer servings of fruits and vegetables per day?
If there are $$200$$ people in the age-group 18- 24 years, approximately what percent of the people surveyed who eat $$5$$ or more servings of fruits and vegetables per day are in the age-group 18-24 years?
Among the people surveyed who eat $$1$$ or $$2$$ servings of fruits and vegetables per day. $$\frac{1}{5}$$ of the men and $$\frac{2}{7}$$ of the women are in the age- group 45-54 years. Which of the following is closest to the total number of people in the age-group 45-54 years?
The average (arithmetic mean) of $$8$$ different integers equals the sum of the $$8$$ integers.

Quantity A

The least of the 8 integers

Quantity B

$$ -2$$


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