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MC1061
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Does anyone know the formula for this? If X is equal to the 30 Nov 2007, 00:07
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Does anyone know the formula for this?

If X is equal to the sum of the even intergers from 40 to 60, inclusive, and Y is the number of even intergers from 40 to 60, inclusive, what is the value of Y.

I can add the 11 interegers (40,42,44,46,48,50,52,54,56,58,60), but I would rather know a formula, just in case the GMAT asks a similar but slightly different question, plus I dont want to waste time on the test adding figures.

Answer is 550=X , 11=X

X+Y=561


Thanks in advance!



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rajpdsouza
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Does anyone know the formula for this? If X is equal to the 30 Nov 2007, 06:30
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MC1061
Does anyone know the formula for this?

If X is equal to the sum of the even intergers from 40 to 60, inclusive, and Y is the number of even intergers from 40 to 60, inclusive, what is the value of Y.

I can add the 11 interegers (40,42,44,46,48,50,52,54,56,58,60), but I would rather know a formula, just in case the GMAT asks a similar but slightly different question, plus I dont want to waste time on the test adding figures.

Answer is 550=X , 11=X

X+Y=561


Thanks in advance!
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(min of range+max of range) x (# of numbers in the set/2)

(40+60)x(11/2)=550. 550+11=561.
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cstefanita
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Does anyone know the formula for this? If X is equal to the 30 Nov 2007, 06:58
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I am assuming the same applies for consecutive odd numbers?
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rajpdsouza
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Does anyone know the formula for this? If X is equal to the 30 Nov 2007, 07:06
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cstefanita
I am assuming the same applies for consecutive odd numbers?
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Yep!

Sum of odd integers 40-60 (41,43,45,47,49,51,53,55,57,59)...

(40+60) (the number of odd integers between 40-60...10/2)= (100)(5)=500.

I just asked this question a couple days ago and BG,walker, and blackbelt were all very helpful.
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MC1061
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Does anyone know the formula for this? If X is equal to the 30 Nov 2007, 10:08
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Thanks rajpdsouza!
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asdert
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Does anyone know the formula for this? If X is equal to the 30 Nov 2007, 10:42
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Beware when counting the numbers in a specific set. Remember to add one before you are done:

Number of numbers of consecutive integers from 45 to 355 inclusive:
355-45+1=311

Number of consecutive even numbers from 20 to 40 inclusive:
40-20/2+1=11



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Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Quantitative Questions Forum
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