灵鹊做题网一道Gmat数学题Yesterday's closing prices of 2,420 different stock
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一道Gmat数学题
Yesterday's closing prices of 2,420 different stocks listed on a certain stock exchange were all different from today's closing prices.The number of stocks that closed at a higher price today than yesterday was 20 percent greater than the number that closed at a lower price.How many of the stocks closed at a higher price today than yesterday?
Yesterday's closing prices of 2,420 different stocks listed on a certain stock exchange were all different from today's closing prices.The number of stocks that closed at a higher price today than yesterday was 20 percent greater than the number that closed at a lower price.How many of the stocks closed at a higher price today than yesterday?
We know that H stocks + low stocks = 2,420
So H+L=2,420
Also that 120% (20% greater) of low stocks = high
So H=120%(L)
1.2L + L = 2,420
L=1,100
Answer=1,320
这个题的难点在于理解题意.假设有L只股票今天的收盘价比昨天低,那H只股票今天的收盘价比昨天高,所以H+L就是总的股票数2,420.
So H+L=2,420
Also that 120% (20% greater) of low stocks = high
So H=120%(L)
1.2L + L = 2,420
L=1,100
Answer=1,320
这个题的难点在于理解题意.假设有L只股票今天的收盘价比昨天低,那H只股票今天的收盘价比昨天高,所以H+L就是总的股票数2,420.