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650-680   题数:457
Of the students who eat in a certain cafeteria, each student either likes or dislikes lima beans and each student either likes or dislikes brussels sprouts. Of these students, 2/3 dislike lima beans; and of those who dislike lima beans, 3/5 also dislike brussels sprouts. How many of the students like brussels sprouts but dislike lima beans? (1) 120 students eat in the cafeteria. (2) 40 of the students like lima beans.
On the number line, the distance between point A and point C is 5 and the distance between point B and point C is 20. Does point C lie between point A and point B ? (1) The distance between point A and point B is 25. (2) Point A lies to the left of point B.
Is the three-digit number n less than 550 ?(1) The product of the digits in n is 30. (2) The sum of the digits in n is 10.
How many different prime numbers are factors of the positive integer n ?(1)Four different prime numbers are factors of 2n. (2)Four different prime numbers are factors of n².
A certain bank charges a maintenance fee on a standard checking account each month that the balance falls below $1,000 at any time during the month. Did the bank charge a maintenance fee on Sue's standard checking account last month?(1) At the beginning of last month, Sue's account balance was $1,500.(2) During last month, a total of $2,000 was withdrawn from Sue's checking account.
For each order, a mail-order bookseller charges a fixed processing fee and an additional shipping fee for each book in the order. Rajeev placed five different orders with this bookseller--an order for 1 book in January, an order for 2 books in February, an order for 3 books in March, an order for 4 books in April, and an order for 5 books in May. What was the total of Rajeev's processing and shipping fees for these five orders?(1) Rajeev's processing and shipping fees were $1.00 more for his order in March than for his order in January.(2) The total of Rajeev's shipping fees for the five orders was $7.50.
A garden store purchased a number of shovels and a number of rakes. If the cost of each shovel was $14 and the cost of each rake was $9, what was the total cost of the shovels and rakes purchased by the store? (1) The ratio of the number of shovels to the number of rakes purchased by the store was 2 to 3.(2) The total number of shovels and rakes purchased by the store was 50.
If n is a three-digit positive integer, what is the sum of the digits of n ? (1) The hundreds digit of n is 3 times the units digit.(2) The hundreds digit of n is 3 more than the tens digit.
Linda, Robert, and Pat packed a certain number of boxes with books. What is the ratio of the number of boxes of books thatRobert packed to the number of boxes of books that Pat packed?(1) Linda packed 30 percent of the total number of boxes of books.(2) Robert packed 10 more boxes of books than Pat did.
At a certain theater, the cost of each adult's ticket is $5 and the cost of each child's ticket is $2. What was the average (arithmetic mean) cost of all the adults' and children's tickets sold at the theater yesterday?(1) Yesterday the ratio of the number of children's tickets sold at the theater to the number of adults' tickets sold at the theater was 3 to 2.(2) Yesterday 80 adults' tickets were sold at the theater.
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