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08 May 2022, 02:36
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D
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Difficulty:
25%
(medium)
Question Stats:
79% (01:47) correct
21%
(02:10)
wrong
based on 1057
sessions
History
Date
Time
Result
Not Attempted Yet
A positive number x is decreased by 60% and the result is increased by 80%. If y is the value after these 2 operations, which of the following gives x in terms of y ?
A. 18/25*y
B. 5/60*y
C. 6/5*y
D. 25/18*y
E. 25/12*y
Source: Skills Insight
A. 18/25*y
B. 5/60*y
C. 6/5*y
D. 25/18*y
E. 25/12*y
Source: Skills Insight
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08 May 2022, 05:58
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A positive number x is decreased by 60%:
\(x*\frac{4}{10} = \frac{4}{10}x\)
This is increased by 80% with the result being y:
\(y = \frac{4}{10}x * \frac{18}{10}\)
\(y = \frac{2}{5}x * \frac{9}{5}\)
\(y = \frac{18}{25}x\)
\(x = \frac{y}{\frac{18}{25}}\)
\(x = y * \frac{25}{18}\)
\(x = \frac{25}{18}y\)
Answer D
\(x*\frac{4}{10} = \frac{4}{10}x\)
This is increased by 80% with the result being y:
\(y = \frac{4}{10}x * \frac{18}{10}\)
\(y = \frac{2}{5}x * \frac{9}{5}\)
\(y = \frac{18}{25}x\)
\(x = \frac{y}{\frac{18}{25}}\)
\(x = y * \frac{25}{18}\)
\(x = \frac{25}{18}y\)
Answer D
General Discussion
09 May 2022, 05:49
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(1.8)(0.4)x=y
Therefore, x=(25/18)y
Answer is D
Therefore, x=(25/18)y
Answer is D
