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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!
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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30 Nov 2007, 06:30
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MC1061
(min of range+max of range) x (# of numbers in the set/2)
(40+60)x(11/2)=550. 550+11=561.
30 Nov 2007, 06:58
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I am assuming the same applies for consecutive odd numbers?
