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If 1050 – 74 is written as an integer in base 10 notation, what is the sum of the digits in that integer?
A certain university will select 1 of 7 candidates eligible to fill a position in the mathematics department and 2 of 10 candidates eligible to fill 2 identical positions in the computer science department.If none of the candidates is eligible for a position in both departments, how many different sets of 3 candidates are there to fill the 3 positions?
A total of 30 percent of the geese included in a certain migration study were male.If some of the geese migrated during the study and 20 percent of the migrating geese were male, what was the ratio of the migration rate for the male geese to the migration rate for the female geese?
[Migration rate for geese of a certain sex = (number of geese of that sex migrating) / (total number of geese of that sex)]
A rectangular region has a fence along three sides and a wall along the fourth side.The fenced side opposite the wall is twice the length of each of the other two fenced sides.If the area of the rectangular region is 128 square feet, what is the total length of the fence, in feet?
主要是题目看不懂，不太明白。另外再问一下，如果一道数据充分题目要求“value of x”,但算出来x=2或x＝－2，算不算得出结论呢？
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发表于 2010-4-1 15:01:04
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