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When the decimal point of a certain positive decimal number is moved six places to the right, the resulting number is 9 times th
When the decimal point of a certain positive decimal number is moved six places to the right, the resulting number is 9 times th
admin
2015-03-24
32
问题
When the decimal point of a certain positive decimal number is moved six places to the right, the resulting number is 9 times the reciprocal of the original number. What is the original number?
选项
答案
0.003
解析
Moving the decimal point of a positive decimal number, n, six places to the right is equivalent to multiplying n by 10
6
. In the question, you are given that the result of such a change is 9 times the reciprocal of the original number, or 9
.Therefore n(10
6
)= 9
. You can solve this equation for n as follows.
n = 0.003
The correct answer is 0.003.
This explanation uses the following strategies.
Strategy 1: Translate from Words to an Arithmetic or Algebraic Representation
Strategy 5: Simplify an Arithmetic or Algebraic Representation
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GRE QUANTITATIVE
GRE
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