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word problems - sentences into algebra

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word problems - sentences into algebra [#permalink]

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New post 08 Nov 2017, 02:24
Sentence : The sum of Richard's age and Cindy's age in years is 17 more than the amount by which Tim's age is greater than Kathy's age.

Translation : R + C = (T - K) + 17

I don't understand (T-K) part.
How 'Tim's age is greater than Kathy's age' can translate '(T-K)'.
Isn't it T > K ?

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word problems - sentences into algebra [#permalink]

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New post 08 Nov 2017, 04:52
Rachelpaw wrote:
Sentence : The sum of Richard's age and Cindy's age in years is 17 more than the amount by which Tim's age is greater than Kathy's age.

Translation : R + C = (T - K) + 17

I don't understand (T-K) part.
How 'Tim's age is greater than Kathy's age' can translate '(T-K)'.
Isn't it T > K ?


Lets break it down, starting with the back half of the question:
"Tim's age is greater than Kathy's age."

So we know right away, T > K.

Next we can look at this part:
"is 17 more than the amount by which"
The "amount" is referring to the difference between T and K, which will be a positive number since Tim is older according to last part of the statement. That gives us T-K, (or |K-T| to cover all bases) which are the only options that produce a positive number

Once we know this, we can just plug in the 17+ and solve for the final equation

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Re: word problems - sentences into algebra [#permalink]

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New post 08 Nov 2017, 11:12
Rachelpaw wrote:
Sentence : The sum of Richard's age and Cindy's age in years is 17 more than the amount by which Tim's age is greater than Kathy's age.

Translation : R + C = (T - K) + 17

I don't understand (T-K) part.
How 'Tim's age is greater than Kathy's age' can translate '(T-K)'.
Isn't it T > K ?


If the text just said 'Tim's age is greater than Kathy's age,' you'd be correct. That would translate as T > K.

However, it actually reads 'the amount by which Tim's age is greater than Kathy's age.'

Here's a much simpler problem with the same phrase in it:

'Tim is 84 years old. Kathy is 72 years old. What is the amount by which Tim's age is greater than Kathy's age?'

You're being asked for a quantity: how much older Tim is. In real life, you'd calculate that by taking 84 - 72, or T - K. On the GMAT, you do the same.
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Re: word problems - sentences into algebra [#permalink]

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New post 13 Nov 2017, 21:03
Here is a great thread that discusses word problems:

https://gmatclub.com/forum/word-problem ... 87346.html
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Re: word problems - sentences into algebra [#permalink]

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New post 14 Nov 2017, 15:25
Rachelpaw wrote:
Sentence : The sum of Richard's age and Cindy's age in years is 17 more than the amount by which Tim's age is greater than Kathy's age.

Translation : R + C = (T - K) + 17

I don't understand (T-K) part.
How 'Tim's age is greater than Kathy's age' can translate '(T-K)'.
Isn't it T > K ?


"Tim's age is greater than Kathy's age" is modifying the noun amount. So the amount by which Tim's age is greater than Kathy's age = the difference between Tim and Kathy's age, which is T-K (since Tim's age is presumably greater).

If the statement just said Tim's age is greater than Kathy's age, then it is T>K
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Re: word problems - sentences into algebra [#permalink]

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New post 15 Nov 2017, 08:58
Rachelpaw wrote:
Sentence : The sum of Richard's age and Cindy's age in years is 17 more than the amount by which Tim's age is greater than Kathy's age.

Translation : R + C = (T - K) + 17

I don't understand (T-K) part.
How 'Tim's age is greater than Kathy's age' can translate '(T-K)'.
Isn't it T > K ?


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Re: word problems - sentences into algebra [#permalink]

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New post 29 Nov 2017, 23:22
Let Richard's age: R
Cindy's age : C
Tim's age : T
Kathy's age : K
sum of Richard's age and Cindy's age = R + C
amount by which Tim's age is greater than Kathy's age = difference of their ages (Where T > K) = T - K
17 more than the amount by which Tim's age is greater than Kathy's age = (T - K) + 17
Hence R + C = (T - K) + 17

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Re: word problems - sentences into algebra   [#permalink] 29 Nov 2017, 23:22
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