- Working alone at a constant rate, Machine A can produce 15 widgets in
2 minutes. Working alone at a constant rate, Machine B can produce 20
widgets in 3 minutes. If the two machines start working at the same time,
after how many minutes will Machine A have produced 40 more widgets
than Machine B?
A 12
B 24
C 36
D 48
E 60 - The birthrate of a certain species is approximately 500 organisms per day.
The death rate of the species is approximately 300 organisms per day. If
the population has 50,000 organisms at the beginning of a certain year,
approximately how many organisms will be in the population at the end
of the year?
A 73,000
B 123,000
C 159,500
D 232,500
E 293,000
For Questions 10 and 11, write your answer in the box.- Bob and Jack start traveling at the same time at constant rates and in the
same direction. If Bob’s rate is 2 miles per hour greater than Jack’s, after
how many hours will Bob and Jack be^15 of a mile apart? - Two scientists, working at the same constant rate, can fill 8 equally sized
beakers in 10 minutes. How many scientists would be needed to fill 24 of
these beakers in 5 minutes?
348 PART 4 ■ MATH REVIEW04-GRE-Test-2018_313-462.indd 348 12/05/17 12:04 pm