in a young camp, the ratio of ther mumbers of tutors and members is 9:250.there are altogether 1036people in the camp. Some tutors will leave the camp earlier due to personal reason. the ratio of the numbers of tutors and members will then become 3:100. how many tutors will leave the camp earlier?
C and D are two points on line segment AB such that AC:CB=1:3 and AD:AB=2:3 . If CD=10 cm, dinf the length of AB
ratio
2008-01-05 9:38 pm
回答 (1)
2008-01-05 10:02 pm
✔ 最佳答案
1)original number of tutors = 1036 * 9 / (9+250) =36
number of members = 1036-36 = 1000
new number of tutors = 36 - n
number of members remains unchange
(36-n) : 1000 = 3 : 100
36 - n = 30
n = 6
∴6 tutors will leave the camp
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