SAT数学Problem Solving练习题(25)
- 2017年07月25日14:53 来源:互联网
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Question 25: If a and b are positive integers and a·b = 200, which of the following can be the sum a + b?
(a) 40
(b) 46
(c) 33
(d) 55
(e) 50
Answer: 200 = 2·2·2·5·5.
If a and b are positive integers, the 2 numbers and their sum can be:
2 + 100 = 102
4 + 50 = 54
5 + 40 = 45
8 + 25 = 33
10 + 20 = 30
(c) is the correct answer.