SAT数学Problem Solving练习题(27)
- 2017年07月26日13:33 来源:互联网
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Question 27: What is the sum of 10% of x and 20% of 2x?
(a) 10% of x
(b) 20% of x
(c) 30% of x
(d) 50% of x
(e) 100% of x
Answer: 10% of x is .1x.
20% of 2x = .2·2x = .4x.
The sum of 10% of x and 20% of 2x is .1·x + .4·x = .5·x. In conclusion the sum is 50% of x.