马上就要考试，急问两道数学题

xiaoapian

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

meixiapeng

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.

hchen_cd

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.