单项选择题

For a project, a square piece of cloth is folded in half and sewed together to form a rectangle that has a perimeter of 36 centimeters. What was the area in square centimeters of the piece of cloth before it was folded

A. 16
B. 36
C. 81
D. 108
E. 144
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单项选择题
The average (arithmetic mean) number of trees per acre in a 40-acre plot is 140. If a 10-acre section of the plot contains 90 trees per acre, how many trees are there in the remaining 30 acres
A. 5,700
B. 4,700
C. 4,200
D. 3,600
E. 2,700
单项选择题
In a group of 80 students, 24 are enrolled in geometry, 40 in biology, and 20 in both. If a student were randomly selected from the 80 students, what is the probability that the student selected would not be enrolled in either course
A. 0.20
B. 0.25
C. 0.45
D. 0.55
E. 0.60
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