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# What is the value of m − 3n?

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Director
Joined: 12 Feb 2015
Posts: 917
What is the value of m − 3n?  [#permalink]

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13 Feb 2019, 10:06
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Difficulty:

15% (low)

Question Stats:

76% (00:36) correct 24% (00:49) wrong based on 67 sessions

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What is the value of $$m − 3n$$?

(1) $$\frac{m}{2}$$ - 8 = $$\frac{3n}{2}$$

(2) $$m$$ = 10

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Manish

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Re: What is the value of m − 3n?  [#permalink]

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13 Feb 2019, 10:12
CAMANISHPARMAR wrote:
What is the value of $$m − 3n$$?

(1) $$\frac{m}{2}$$ - 8 = $$\frac{3n}{2}$$

(2) $$m$$ = 10

we are looking for m - 3n.

Statement 1: $$\frac{m}{2}$$ - 8 = $$\frac{3n}{2}$$

$$\frac{m}{2}$$ - $$\frac{3n}{2}$$ = 8

$$\frac{m - 3n}{2}$$= 8

m - 3n = 16.

Sufficient.

Statement 2 : m = 10. clearly NOT sufficient. we don't know the value of n.

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Re: What is the value of m − 3n?  [#permalink]

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14 Feb 2019, 00:02

Solution

To find:
• The value of the expression m – 3n

Analysing Statement 1
As per the information given in statement 1, $$\frac{m}{2} – 8 = \frac{3n}{2}$$

We can write this expression as:
• $$\frac{m}{2} – 8 = \frac{3n}{2}$$
Or, $$\frac{m}{2} – \frac{3n}{2} = 8$$
Or, m – 3n = 8 x 2 = 16

Hence, statement 1 is sufficient to answer the question.

Analysing Statement 2
As per the information given in statement 2, m = 10.
• However, from this statement, we cannot infer any information about the value of n.

Hence, statement 2 is not sufficient to answer the question.

Hence, the correct answer is option A.

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Re: What is the value of m − 3n?  [#permalink]

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19 Feb 2019, 04:54
CAMANISHPARMAR wrote:
What is the value of $$m − 3n$$?

(1) $$\frac{m}{2}$$ - 8 = $$\frac{3n}{2}$$

(2) $$m$$ = 10

from 1)

{m - 16}/ 2 - 3n/2 = 0

m-16-3n = 0

m-3n = 16

sufficient A
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Re: What is the value of m − 3n?   [#permalink] 19 Feb 2019, 04:54
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