Problem
If
y
is 45 percent of
x
and
z
is 25 percent of
x
, what is
y
+
z
in terms of
x
?
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SAT: Multiple-Choice Question #5 |
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Question:
The population of a particular suburb of a major city doubles every 8 years. Approximately how many years will it take for the population to grow from 2,000 to 65,000 people?
Choices:
This question concerns the doubling of the population of a suburb. Let's start by getting a feel for how many times you have to double 2,000 to get to 65,000 people:
| 2,000 |
; |
4,000 |
; |
8,000 |
; |
16,000 |
; |
32,000 |
; |
64,000 |
The population doubles five times before reaching approximately 65,000 people. Since each doubling period takes 8 years, the correct answer is going to be approximately five times that amount, or 40 years. Choice (D) is the correct answer.
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