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方程   题数：237
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.
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.
A family-size box of cereal contains more cereal and costs more than the regular-size box of cereal. What is the cost per ounce of the family-size box of cereal?(1) The family-size box of cereal contains 10 ounces more than the regular-size box of cereal.(2) The family-size box of cereal costs $5.40.
How many hours did it take Helen to drive from her house to her parents' house? (1) Helen's average speed on this trip was 72 kilometers per hour. (2) If Helen's average speed on this trip had been 8 kilometers per hour greater, it would have taken her 1 hour less.
What is the value of 5x2+4x−1 ​? (1) x(x + 2) = 0 (2) x = 0
If x and y are positive, what is the value of x – y?(1) (x2 – y2) / (x + y) = 4(2) x + y = 7
【OG20-P273-238题】Each of the 256 solid-colored marbles in a box is either blue, green, or purple . What is the ratio of the number of blue marbles to the number of purple marbles in the box?(1)The number of green marbles in the box is 4 times the number of blue marbles in the box.(2)There are 192 green marbles in the box.
If a > 0, b > 0, and c > 0, is a(b - c) = 0 ?(1) b – c = c - b(2)b/c=c/b
If v and w are different integers, does v = 0 ?(1) vw= v2 ​(2) w = 2
At a refreshment stand, each can of soda sells for the same price and each sandwich sells for the same price. What is the total price for 2 sandwiches and 3 cans of soda at the stand? (1) At the stand the total price for 1 sandwich and 1 can of soda is $3. (2) At the stand the total price for 3 sandwiches and 2 cans of soda is $8.
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