40%的人hold round trip tickets 同时也带了自己的car. 20%的人who hold round trip 没带car.问hold round trip tickets的人有百分之几
答案是否为60%
第二题:the sides of a square region,measured to the nearest centimeters are 6 centimeters long,the least possible value of the actual area of the square region is:
a.36.00
b.35.00
c.33.75
d.30.25
e.25.00
能否告知解题的过程?谢谢
1.it seems imcomplete in the first question,how about the other 40%people who hold the ticket ? neither with nor without the car?
2.the nearest centimeter of 5.5 is 6.so it should be 5.5x5.5.
第一题见过,好像和你的说法不一样。按你的条件,设X%有round trip tickets. 那么他们中80%有车,所以X%*80%=40%(既有round trip tickets又有车),;因而X%=50%。
第二题,能够四舍五入到6的最小数是5.5, 所以最小可能的面积是5.5^2 = 30.25.
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