# GRE数学代数重点例题(3)

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21.Sixty-eight people are sitting in 20 cars and each car contains at most 4 people. What is the maximum possible number of cars that could contain exactly 1 of the 68 people?

A.2

B.3

C.4

D.8

E.12

22.Art,Bob and Carmen share a prize of \$400. If Art receives twice as much as Bob, and if Bob receives 1/2 as much as Carmen, how much does Carmen receive?

A.\$20

B.\$40

C.\$80

D.\$140

E.\$160

23.A time-study specialist has set the production rate for each worker on a contain job at 22 units every 3 hours. At this rate what is the minimum number of worker that should be put on the job if at least 90 units are to be produced per hour?

A.7%

B.7.5%

C.8%

D.8.5%

E.9%

24.To obtain an FHA mortgage for \$50,000 or more, the home buyer must have a down payment equal to 4 percent of the first \$25,000 of the mortgage amount and 5 percent of the portion in excess of \$25,000. At settlement the buyer pays a mortgage insurance premium equal to 3 percent of the mortgage amount. What is the maximum FHA mortgage, if any, a buyer can obtain if the buyer has only \$6,000 available for the down payment and insurance premium?

A. \$62,500

B. \$71,875

C. \$78,125

D. \$125,000

E. The home buyer cannot obtain an FHA mortgage.

25. Working alone, a small pump takes twice as long as a large pump takes to fill an empty tank. Working together at their respective constant rates, the pumps can fill the tank in 6 hours. How many hours would it take the small pump to fill the tank working alone?

A.8

B.9

C.12

D.15

E.18

26.A candy assortment consists of seven flavors of chocolate-covered creams packed in two-layered boxes with 27 creams in each layer. The flavors are always packed in rows so that the flavor varies with each piece in the following order: vanilla, orange, cherry, vanilla raspberry, lime, pecan, cherry, lemon. How many chocolate- covered vanilla creams are needed to peak 200 boxes of the assortment?

A.600

B.1,200

C.1,800

D.2,400

E.3,600

27.A research scientist wants to study a certain attribute of dogs. It is estimated that approximately 5 percent of all dogs have this attribute. If the scientist wants to study a sample of N dogs having the attribute, approximately how many dogs should be screened in order to obtain the desired sample size?

A.N/5

B.5N

C.20N

D.105N

E.120N

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