[計量] JJ求解
3. Pqst is a rectangle pq=3 pt=6 r is a pt on qt such that area of trapezium pqrt=12 what is the perimeter of trapezium pqrt
4. Which of the following is both the mean and the median of 7 consecutive integer so that the least of which is x.
A. x+4
B. x+3
C. x+2
D. x+28/7
E. x+3/2
8. John traveled 80% of the way from Yellow-town to Green-fields by train at an average speed of 80 miles per hour. The rest of the
way John traveled by car at an average speed of v miles per hour. If the average speed for the entire trip was 60 miles per hour,
what is v in miles per hour?
(a) 30
(b) 40
(c) 50
(d) 55
(e) 70
10.In a nationwide poll, N people were interviewed . If 1/4 of them answered "yes" to question 1, and of those , 1/3 answered "yes to
question2, which of the following expresions represents the number of people interviewed who did not answer "yes" to both
questions?
A : N/7
B : 6N/7
C : 5N/12
D : 7N/12
E : 11N/12
7. Out of 10 shirts, 2 are defective. 3 are selected. what is the probabiltiy that none is defective?
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