Q28: Each of the 30 boxes in a certain shipment with either 10 pounds or 20 pounds, and the average (arithmetic mean) weight of the boxes in the shipment is 18 pounds.If the average weight of the boxes in the shipment is to be reduced to 14 pounds by removing some of the 20-pound boxes, how many 20-pound boxes must be removed?
A.4
B.6 C.10
D.20
E.24
我怎么算是12呢 可选项没有。。。。
Q10:
In the figure shown, two identical squares are inscribed in the rectangle.If the perimeter of the rectangle is 18√2, then what is the perimeter of each square?
A.8√2
B.12 C.12√2
D.16
E.18
我算是24 可是选项也没有 啊 。。。唉
Q32: Seven different numbers are selected from the integers 1 to 100, and each number is divided by 7.What is the sum of the remainders? (1)The range of the seven remainders is 6. (2) The seven numbers selected are consecutive integers.
data sufficiency 我认为呢 1 和2 说的不是一回事吗 怎么选b 不选a 呢 ？？？？
We know the remainder can be from 0 to 6, if remainder is 0,1,1,1,1,1,6, the range is 6; if remainder is 0,1,2,3,4,5,6, the range is also 6. So option a is telling me nothing. Option b is valid because you can only have ONE outcome, which is 0,1,2,3,4,5,6
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发表于 2011-2-17 18:26:06
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发表于 2011-2-17 19:35:38
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