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If js ­– k = m, what is s? (1) ms = k (2) j/m = 4

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If js ­– k = m, what is s? (1) ms = k (2) j/m = 4 [#permalink]

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New post 07 Sep 2017, 22:59
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Re: If js ­– k = m, what is s? (1) ms = k (2) j/m = 4 [#permalink]

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New post 07 Sep 2017, 23:20
Bunuel wrote:
If js ­– k = m, what is s?

(1) ms = k
(2) j/m = 4


(1) ms=k
no info abt j..not suff

(2) no inf abt k..not suff

on combining

(j/m)*s - (k/m) = 1
4s-s=1
3s = 1
s=1/3
Suff
C
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If js ­– k = m, what is s? (1) ms = k (2) j/m = 4 [#permalink]

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New post 07 Sep 2017, 23:51
Rewriting the equation,
\(js = m + k\)
\(js - m = k\)
\(js^2 - ms = ks\)

1. \(ms = k\)
But only knowing value of ms is not enough(Insufficient)

2.\(\frac{j}{m} = 4\)
\(j = 4m\)
Knowing only the value of j is not enough (Insufficient)

We know that \(js^2 - ks = ms\)
On combining the information and substituting the values,
\(4m*s^2 - ms^2 = ms\)
\(3m*s^2 = ms\)
\(s = \frac{1}{3}\) (Sufficient) (Option C)
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If js ­– k = m, what is s? (1) ms = k (2) j/m = 4 [#permalink]

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New post 09 Sep 2017, 04:07
pushpitkc wrote:
Rewriting the equation,
\(js = m + k\)
\(js - m = k\)
\(js^2 - ms = ks\)

1. \(ms = k\)
But only knowing value of ms is not enough(Insufficient)

2.\(\frac{j}{m} = 4\)
\(j = 4m\)
Knowing only the value of j is not enough (Insufficient)

We know that \(js^2 - ks = ms\)
On combining the information and substituting the values,
\(4m*s^2 - ms^2 = ms\)
\(3m*s^2 = ms\)
\(s = \frac{1}{3}\) (Sufficient) (Option C)


Why did you reduce 's'? are you sure that either s does not equal 0? We can reduce m because we from statement 2 that it can't be 0, otherwise, it would not be defined.

\(3*s^2 = s\)

\(3*s^2 - s = 0\)

\(s(3s - 1) = 0\)

s = 0 or s =1/3

so s could be 0 or 1/3........Insufficient
If js ­– k = m, what is s? (1) ms = k (2) j/m = 4   [#permalink] 09 Sep 2017, 04:07
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