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05 Sep 2019, 03:48
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D
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
5%
(low)
Question Stats:
88% (01:03) correct
12%
(01:22)
wrong
based on 130
sessions
History
Date
Time
Result
Not Attempted Yet
What is the sum of all even integers between 30 and 50, inclusive?
A. 640
B. 540
C. 480
D. 440
E. 240
A. 640
B. 540
C. 480
D. 440
E. 240
Archit3110
Major Poster
05 Sep 2019, 07:12
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Bunuel
sum of even intgers 0-50; 50*52/4 ; 650
and sum of even integers 0-28 ; 28*30/4 ; 210
so ∆ ; 650-210 ; 440 sum of even integers 30 to 50
IMO D
greenisthecolor
05 Sep 2019, 07:39
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Sum = Average * Number of integers
Number of even integers = Number of integers divisible by 2 = \(\frac{50-30}{2}+1\) = 11
Average = \(\frac{50+30}{2}+1\) = 40
Sum = 40 * 11 = 440. (D)
Number of even integers = Number of integers divisible by 2 = \(\frac{50-30}{2}+1\) = 11
Average = \(\frac{50+30}{2}+1\) = 40
Sum = 40 * 11 = 440. (D)
