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# Sentence Correction Question from GMAC: Rate of vs Rate times

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Manager
Joined: 20 Jan 2016
Posts: 88
Schools: HBS '18
WE: Consulting (Other)
Sentence Correction Question from GMAC: Rate of vs Rate times  [#permalink]

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16 May 2018, 07:17
I remember on one of my GMAC Question of Day I got an SC question that made me choose between:

Trees grow at a rate of five times that of flowers.

Trees grow at a rate five times the rate of flowers.

Are there any guidelines on that or they both correct?

Source: GMAC Question of Day
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Migatte no Gokui

Intern
Joined: 11 Sep 2017
Posts: 46
GMAT 1: 600 Q42 V31
Re: Sentence Correction Question from GMAC: Rate of vs Rate times  [#permalink]

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16 May 2018, 07:21
1
oasis90 wrote:
I remember on one of my GMAC Question of Day I got an SC question that made me choose between:

Trees grow at a rate of five times that of flowers.

Trees grow at a rate five times the rate of flowers.

Are there any guidelines on that or they both correct?

Source: GMAC Question of Day

At a rate of - is incorrect usage.
Manager
Joined: 20 Jan 2016
Posts: 88
Schools: HBS '18
WE: Consulting (Other)
Re: Sentence Correction Question from GMAC: Rate of vs Rate times  [#permalink]

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17 May 2018, 08:07
DinkarDK wrote:
oasis90 wrote:
I remember on one of my GMAC Question of Day I got an SC question that made me choose between:

Trees grow at a rate of five times that of flowers.

Trees grow at a rate five times the rate of flowers.

Are there any guidelines on that or they both correct?

Source: GMAC Question of Day

At a rate of - is incorrect usage.

I have seen rate of so many times while reading. Rate of 5% or any percentage
_________________

Migatte no Gokui

Intern
Joined: 15 Aug 2013
Posts: 40
Re: Sentence Correction Question from GMAC: Rate of vs Rate times  [#permalink]

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17 May 2018, 12:52
oasis90 wrote:
I remember on one of my GMAC Question of Day I got an SC question that made me choose between:

Trees grow at a rate of five times that of flowers.
This is correct. It clearly compares growth rate of tress to growth rate of flowers.

Trees grow at a rate five times the rate of flowers.
But here comparison is not proper .Comparison is between growth rate of tree V/s rate of flower(its not growth rate).
It is not the correct comparison.
Are there any guidelines on that or they both correct?

Source: GMAC Question of Day
Manager
Joined: 29 Dec 2013
Posts: 55
GMAT 1: 770 Q48 V51
Re: Sentence Correction Question from GMAC: Rate of vs Rate times  [#permalink]

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18 May 2018, 03:58
1
Hi oasis90,

at a rate of (exact rate) => at a rate of 5%, at a rate of 10 cents per mile, at a rate of 40 km/h, at a rate of a foot per year
at a rate (comparison: x times/double/triple) => cats age at a rate three times that of dogs, paintings appreciate at a rate 10 times that of sculptures

So, in your example, "at a rate of five times that ..." is wrong because this is a comparison, not an exact rate.

Best, Jennifer
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Manager
Joined: 20 Jan 2016
Posts: 88
Schools: HBS '18
WE: Consulting (Other)
Re: Sentence Correction Question from GMAC: Rate of vs Rate times  [#permalink]

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18 May 2018, 07:53
jennpt wrote:
Hi oasis90,

at a rate of (exact rate) => at a rate of 5%, at a rate of 10 cents per mile, at a rate of 40 km/h, at a rate of a foot per year
at a rate (comparison: x times/double/triple) => cats age at a rate three times that of dogs, paintings appreciate at a rate 10 times that of sculptures

So, in your example, "at a rate of five times that ..." is wrong because this is a comparison, not an exact rate.

Best, Jennifer

Jennifer. Thank you for the great explanation.
_________________

Migatte no Gokui

Intern
Joined: 07 Dec 2017
Posts: 17
Re: Sentence Correction Question from GMAC: Rate of vs Rate times  [#permalink]

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18 May 2018, 08:49
1
For comparisons, we use at a rate x times the rate..
Re: Sentence Correction Question from GMAC: Rate of vs Rate times &nbs [#permalink] 18 May 2018, 08:49
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