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05 Sep 2019, 04:47
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C
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Difficulty:
15%
(low)
Question Stats:
85% (01:26) correct
15%
(01:55)
wrong
based on 181
sessions
History
Date
Time
Result
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If \(\frac{1}{x}= 2.5\), then what is the value of \(\frac{1}{x – \frac{2}{3}}\)?
A. 2.25.
B. –3.5.
C. –3.75.
D. 1.75.
E. 3.75.
A. 2.25.
B. –3.5.
C. –3.75.
D. 1.75.
E. 3.75.
05 Sep 2019, 10:18
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2.5*x=1 => 1/2.5=10/25=2/5=x
1/(2/3-2/5)= -15/4=-3.75
Answer C
1/(2/3-2/5)= -15/4=-3.75
Answer C
06 Sep 2019, 04:34
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Hello,
I got this question wrong and I'm reviewing my answer and I see why, but I'm stuck at how I'm supposed to calculate the correct answer.
Here is how I calculated:
1/x = 2.5
2.5x = 1
x = 1/2.5 <-- (change this to 2/5)
x = 2/5
And then I do this:
1/(2/5 - 2/3) <-- (change these to denominators of 15)
1/(6/15 - 10/15)
1/(-4/15)
At this point I am confused as to how to proceed next. How would I achieve -15/4?
I got this question wrong and I'm reviewing my answer and I see why, but I'm stuck at how I'm supposed to calculate the correct answer.
Here is how I calculated:
1/x = 2.5
2.5x = 1
x = 1/2.5 <-- (change this to 2/5)
x = 2/5
And then I do this:
1/(2/5 - 2/3) <-- (change these to denominators of 15)
1/(6/15 - 10/15)
1/(-4/15)
At this point I am confused as to how to proceed next. How would I achieve -15/4?
