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11 Mar 2018, 21:04
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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:
83% (01:04) correct
17%
(01:17)
wrong
based on 143
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In a classroom with 6 girls, the average height is x centimeters. If Jenelle joins the class, the average height will be x−1 centimeters. How tall, in centimeters, is Jenelle?
A. x
B. x − 1
C. x − 6
D. x − 7
E. x − 8
A. x
B. x − 1
C. x − 6
D. x − 7
E. x − 8
12 Mar 2018, 00:16
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Bunuel
6girls avg = x
total sum = 6x
now \(\frac{6x+ J}{7}\) = x-1
7x-7 = 6x+j
J= x-7
12 Mar 2018, 01:32
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Bunuel
There are 7 girls in the classroom with the inclusion of Jenelle, and the average
height of the class was x centimeters when Jenelle was not there.
Now, Jenelle would have to be 7 centimeters less than the class average
if the new average height of the class is x-1 centimeters.
Therefore, Jennele's height is x-7(Option D)
