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[转帖]11月10号的一些数学JJ
考完后放松了一阵,天天替女儿洗尿布中。。。JJ忘了不少。
数据充分题 There are 5 books on a shelf, some are english, the others are spanish. Randomly pick two, what is the probability that at least 1 is english? 1. probability of the two books are both spanish is 1/10 2. probability of the two books are both english is 3/10
If m and k are consective even numbers, is k > m? 1. m+2 and k-2 are not consecutive even number 2. k-1 and m+3 are consecutive odd number (我记不清真确题目是啥样的了,意思是这样)
if product a cost $8 and sells at $10, and product b cost $9.5 and sells at $13, then for a total of 834 products sold, is the net profit exceeding 2000? 1. more than 1/2 of the product sold is product a 2. at least 100 product b is sold.
k is a positive integer. if 2^k is devided by 10, what is the remainder? 1. k is the multiple of 10 2. k is the multiple of 4
l and t are two lines on the x-y plane. Is the slope of l greater than the slope of t? 1. l intersect x axis at (1,0) and t intersect x axis at (-1,0) 2. l intersect t on the positive segment of the y axis.
if 5^(-x) > 3 ^(-y), is x >y ? 1. xy>0 2. (不记得了,这题毁了我一半脑细胞,还没做出来)
brand A syrup is stored in a cylinder shaped barrel of height h and diameter D. brand B syrup is stored in a barrel of height 2h and diameter T. Which one is cheapter per liter? 1. 3D=5T 2. A sells at 13.5$, and B selss at 17$ per cylinder.
其他一些数学题: if a stock is originally priced at x, then the price increase by s percent, and then the price is again increaced by y dollars, what is the actual percentage by which the stock price increased from x? (这题其实很搞,一不小心就把表达式写错)
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