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Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.  If mn = 3 and 1/m + 1/n = 4/3, then what is the value of 0.1 + 0.1^1/m

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Math Expert V
Joined: 02 Sep 2009
Posts: 58453
If mn = 3 and 1/m + 1/n = 4/3, then what is the value of 0.1 + 0.1^1/m  [#permalink]

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Difficulty:   25% (medium)

Question Stats: 77% (02:17) correct 23% (02:39) wrong based on 61 sessions

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If $$mn = 3$$ and $$\frac{1}{m} + \frac{1}{n} = \frac{4}{3}$$, then what is the value of $$(0.1) + (0.1)^\frac{1}{m} + (0.1)^\frac{1}{n}$$ ?

(A) $$0.2 + 0.1^\frac{1}{3}$$

(B) $$0.1 + 0.1^\frac{1}{3} + 0.1^\frac{1}{2}$$

(C) $$0.1 + 0.1^\frac{4}{3} + 0.1^\frac{1}{2}$$

(D) $$0.1 + 0.1^\frac{1}{3} + 0.1^\frac{3}{2}$$

(E) $$0.1 + 0.1^\frac{1}{4} + 0.1^\frac{1}{2}$$

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Intern  B
Joined: 09 Apr 2018
Posts: 32
If mn = 3 and 1/m + 1/n = 4/3, then what is the value of 0.1 + 0.1^1/m  [#permalink]

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mn = 3 => m = n/3 1/m + 1/n = 4/3 =>m+n/mn = 4/3 (we know that mn = 3) => m+n = 4
Substituting for m below:
m+n=4 => n/3 + n = 4 => we get the equation to solve for n(n2-4n+3=0) and we get n=1 or n=3.
Using these values, we know that m will also be either 1 or 3.
Hence Answer is A.

Intern  B
Joined: 24 Jun 2018
Posts: 35
Re: If mn = 3 and 1/m + 1/n = 4/3, then what is the value of 0.1 + 0.1^1/m  [#permalink]

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An easy way to solve the question is by options:

We know 1/m + 1/n = 4/3

In all the options from B thru E, there is an initial (.1) with unity power and two .1s with a fractional power

Since question statement asks us to evaluate .1 + .1^(1/m) + .1^(1/n), we can see that the fractional powers in the options(from B to E) must be equal to 1/m + 1/n (which we know to be 4/3)

Considering each option from B to E, adding the fractional powers we see no fractions getting added to 4/3

Hence we can eliminate B to E and select A as the answer
Intern  B
Joined: 31 Aug 2014
Posts: 11
Re: If mn = 3 and 1/m + 1/n = 4/3, then what is the value of 0.1 + 0.1^1/m  [#permalink]

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lynnglenda wrote:
mn = 3 => m = n/3 1/m + 1/n = 4/3 =>m+n/mn = 4/3 (we know that mn = 3) => m+n = 4
Substituting for m below:
m+n=4 => n/3 + n = 4 => we get the equation to solve for n(n2-4n+3=0) and we get n=1 or n=3.
Using these values, we know that m will also be either 1 or 3.
Hence Answer is A.

how did you get to the step in bold above? Re: If mn = 3 and 1/m + 1/n = 4/3, then what is the value of 0.1 + 0.1^1/m   [#permalink] 23 Apr 2019, 05:46
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If mn = 3 and 1/m + 1/n = 4/3, then what is the value of 0.1 + 0.1^1/m

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