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13 Aug 2019, 03:51
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B
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The average (arithmetic mean) of 110, 30, and 85 is 10 less than the average of 40, 100, and
A. 110
B. 115
C. 120
D. 125
E. 130
A. 110
B. 115
C. 120
D. 125
E. 130
13 Aug 2019, 03:57
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(110×30+85)/3=( x+ 40+100 )/3 -10
225/3=140+x /3 - 30/3
225=x+110
X=115
Option B
Posted from my mobile device
225/3=140+x /3 - 30/3
225=x+110
X=115
Option B
Posted from my mobile device
13 Aug 2019, 04:01
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Bunuel
The average (arithmetic mean) of 110, 30, and 85 is 10 less than the average of 40, 100, and
A. 110
B. 115
C. 120
D. 125
E. 130
A. 110
B. 115
C. 120
D. 125
E. 130
Asked: The average (arithmetic mean) of 110, 30, and 85 is 10 less than the average of 40, 100, and
The average (arithmetic mean) of 110, 30, and 85 = (110+30+85)/3 = 225/3 = 75
Let the number be x
(40+100+x)/3 = 85
140 + x = 255
x = 255 - 140 = 115
IMO B
