King School has an enrollment of 900 students. The school day consists of 6 class periods during which each class is taught by one teacher. There are 30 students per class. Each teacher teaches a class during 5 of the 6 class periods and has one class period free. No students have a free class period. How many teachers does the school have?

【OG20-P274-242题】Each of the n employees at a certain company has a different annual salary. What is the median of the annual salaries of the n employees?(1)When the annual salaries of the n employees are listed in increasing order, the median is the 15th salary.(2)The sum of the annual salaries of the n employees is $913, 500.

【OG20-P797-824题】Although some had accused Smith, the firm’s network manager, of negligence when the crucial data went missing, the CEO defused a situation that was quite tense with her public statement that the debacle was not Smith’s fault.

Even with the proposed budget cuts and new taxes and fees, the city's projected deficit for the next budget year is getting worse: administration officials announced that they believe the gap will be $3.7 billion, a billion dollars over what it was predicted just two months ago.

Set S consists of 5 values, not necessarily in ascending order: {4, 8, 12, 16, x}. For how many values of x does the mean of set S equal the median of set S?

【OG20-P602-739题】Between 1980 and 2000 the sea otter population of the Aleutian Islands declined precipitously. There were no signs of disease or malnutrition, so there was probably an increase in the number of otters being eaten by predators. Orcas will eat otters when seals, their normal prey, are unavailable, and the Aleutian Islands seal population declined dramatically in the 1980s. Therefore, orcas were most likely the immediate cause of the otter population decline.Which of the following, if true, most strengthens the argument?

A site once used as an observatory by the Anasazi, ancient pueblo dwellers of New Mexico, has been recently discovered where patterns of light and shadow were employed to establish the precise limits of the positions of the Sun and Moon over a nineteen-year cycle.

A natural response of communities devastated by earthquake or flood is to rebuild on the same site, overlooking the possibility that the forces that caused it could be repeated.

Many of them chiseled from solid rock centuries ago, the mountainous regions of northern Ethiopia are dotted with hundreds of monasteries.

Gusty westerly winds will continue to usher in a seasonably cool air mass into the region, as a broad area of high pressure will build and bring fair and dry weather for several days.