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Math Expert V
Joined: 02 Sep 2009
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If r=0.345, s=(0.345)^2, and t=root(0.345), which of the  [#permalink]

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Question Stats: 66% (00:55) correct 34% (01:01) wrong based on 751 sessions

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If $$r=0.345$$, $$s=0.345^2$$, and $$t=\sqrt{0.345}$$, which of the following is the correct ordering of $$r$$, $$s$$, and $$t$$ ?

A. r < s < t
B. r < t < s
C. s < t < r
D. s < r < t
E. t < r < s

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GMAT 1: 800 Q51 V49 GRE 1: Q170 V170 Re: If r=0.345, s=(0.345)^2, and t=root(0.345), which of the  [#permalink]

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Hi All,

This prompt showcases some great Number Property rules that you're likely to face (in some way or another) on the Official GMAT.

Regardless of the actual numbers involved, IF you're dealing with a positive fraction (meaning a value that is greater than 0 and less than 1), then there are some rules to remember...

1) Squaring that fraction will make the result SMALLER
2) Square-rooting that fraction will make the result BIGGER

Here are some additional Number Property rules for NEGATIVE fractions (meaning a value that is less than 0 and greater than -1)....

1) Squaring that fraction will make the result BIGGER (since squaring a negative creates a positive) AND the result will be CLOSER to 0.
2) Cubing that fraction will make the result BIGGER (since the result will be closer to 0).

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Rich
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Math Expert V
Joined: 02 Sep 2009
Posts: 58320
If r=0.345, s=(0.345)^2, and t=root(0.345), which of the  [#permalink]

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If $$r=0.345$$, $$s=0.345^2$$, and $$t=\sqrt{0.345}$$, which of the following is the correct ordering of $$r$$, $$s$$, and $$t$$ ?

A. r < s < t
B. r < t < s
C. s < t < r
D. s < r < t
E. t < r < s

If $$x$$ is in the range $$0<x<1$$ then: $$0<x^2<x<\sqrt{x}<1$$.

Consider the simpler example: if $$x=\frac{1}{4}$$ then $$0<\frac{1}{16}<\frac{1}{4}<\frac{1}{2}<1$$.

So, $$s<r<t$$.

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Re: If r=0.345, s=(0.345)^2, and t=root(0.345), which of the  [#permalink]

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girikorat wrote:
If r = 0.345, s = (0.345)^2, and t = sqrt(0.345) , which of the following is the correct ordering of r, s, and t ?

A. r < s < t
B. r < t < s
C. s < t < r
D. s < r < t
E. t < r < s

CONCEPT:For solving any such question, One must know that

1) If 0<x<1, then the higher powers of x result in smaller numbers and lower powers of x result in a bigger number
2) If x>1, then the higher powers of x result in Bigger numbers and lower powers of x result in a Smaller number

Here since 0.345 is between 0 and 1 therefore

the number with the highest power i.e. s must be least
and the number with the Lowest power i.e. t must be Biggest number

therefore s < r < t

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GMAT 1: 800 Q51 V49 GRE 1: Q170 V170 Re: If r=0.345, s=(0.345)^2, and t=root(0.345), which of the  [#permalink]

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Hi All,

This question is based on a couple of important Number Property rules regarding positive fractions (between 0 and 1):

1) When 'squaring' a positive fraction, the result gets SMALLER (e.g.. (1/2)^2 = 1/4).

Since 'square-rooting' is the opposite of 'squaring'....

2) When 'square-rooting' a positive fraction, the result gets BIGGER.

While these rules are not tested that often on the Official GMAT, it's likely that you'll be tested on either or both at least once on Test Day.

GMAT assassins aren't born, they're made,
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Re: If r=0.345, s=(0.345)^2, and t=root(0.345), which of the  [#permalink]

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Bunuel wrote:
If $$r=0.345$$, $$s=0.345^2$$, and $$t=\sqrt{0.345}$$, which of the following is the correct ordering of $$r$$, $$s$$, and $$t$$ ?

A. r < s < t
B. r < t < s
C. s < t < r
D. s < r < t
E. t < r < s

Let $$r = 0.36$$ ; $$s = 0.36^2$$ & $$t = \sqrt{0.36}$$

So, $$r = 0.36 , s ≈ 0.13$$ & $$t = 0.60$$

Thus, $$s < r < t = 0.13 < 0.36 < 0.60$$

Hence, answer will be (D) $$s < r < t$$
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Re: If r=0.345, s=(0.345)^2, and t=root(0.345), which of the  [#permalink]

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Bunuel wrote:
If $$r=0.345$$, $$s=0.345^2$$, and $$t=\sqrt{0.345}$$, which of the following is the correct ordering of $$r$$, $$s$$, and $$t$$ ?

A. r < s < t
B. r < t < s
C. s < t < r
D. s < r < t
E. t < r < s

Since r is a positive decimal between 0 and 1, s = r^2 and t = √r. We see that when r is raised to a power > 1, its value decreases, and when it is raised to a power < 1, its value increases (recall that square root means ½ power). Thus, the correct ordering is s < r < t.

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Posts: 3074
Re: If r=0.345, s=(0.345)^2, and t=root(0.345), which of the  [#permalink]

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Solution

Given:
• r=0.345
• s=$$0.345^2$$
• t=√0.345

To find:
• The correct order of r, s, and t among the given options.

Approach and Working

For 0< x <1:
• On increasing the power of x, the value of power of x will decrease.
o For example: 0.5 >$$0.5^2$$

• On decreasing the power of x, the value of power of x will increase.
o For example: $$0.5^2$$ < 0.5

Thus, we can conclude that: s< r and r <t
• Hence, s < <r < t

Correct answer: Option D
_________________ Re: If r=0.345, s=(0.345)^2, and t=root(0.345), which of the   [#permalink] 28 Oct 2018, 13:56
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