- (Topic 2)
Correct Answer:D
- (Topic 2)
At a factory. 6 machines work independently at the same constant rate to produce certain parts. If 5 of the machines, working simultaneously at this rate, produce a total of 200 such parts in 4 days, how many days will it take all 6 machines, working simultaneously at this rate, to produce a total of 300 such parts?
Correct Answer:C
- (Topic 3)
Scientists have long debated the exact timing of the lunar cataclysm, a period approximately 4 billion years ago when Earth and the Moon were pummeled with asteroids. A clue to this puzzle may come from spherules, millimeter-sized droplets of molten rock formed after an asteroid collides explosively with a planet. Upon impact, the asteroid vaporizes both itself and the target rock. producing a vapor plume that condenses into spherules. These form a layer preserved in rock, whose age can be estimated using radiometric dating. Scientists know of fourteen of these spherule layers scattered across Earth, but none dates to the theorized lunar cataclysm time period. Four layers, however, are from between 3.47 and 3.24 billion years ago. indicating perhaps a slow decline in collisions.
Which of the following might plausibly account for the findings in the highlighted sentence?
Correct Answer:A
- (Topic 2)
Exhibit.
Correct Answer:B
- (Topic 2)
A health club lias SOO members. 175 of whom exercised last Friday and 450 of whom exercised last Saturday. Of the members who exercised on at least one of the two days. 90 exercised both last Friday and last Saturday. Which of the following statements are true?
Correct Answer:A
- (Topic 3)
Correct Answer:B