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22 Mar 2019, 00:56
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B
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The average (arithmetic mean) of 20 numbers is 30, and the average (arithmetic mean) of 30 other numbers is 20. What is the average of all 50 numbers?
(A) 23
(B) 24
(C) 25
(D) 26
(E) 27
(A) 23
(B) 24
(C) 25
(D) 26
(E) 27
22 Mar 2019, 04:02
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Bunuel
The average (arithmetic mean) of 20 numbers is 30, and the average (arithmetic mean) of 30 other numbers is 20. What is the average of all 50 numbers?
(A) 23
(B) 24
(C) 25
(D) 26
(E) 27
(A) 23
(B) 24
(C) 25
(D) 26
(E) 27
sum of 20 no = 600
and sum of 30 o = 600
so
1200/50 = 24
IMO B
24 Mar 2019, 18:35
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Bunuel
The average (arithmetic mean) of 20 numbers is 30, and the average (arithmetic mean) of 30 other numbers is 20. What is the average of all 50 numbers?
(A) 23
(B) 24
(C) 25
(D) 26
(E) 27
(A) 23
(B) 24
(C) 25
(D) 26
(E) 27
Average = (20 x 30 + 30 x 20)/50
Average = 1200/50
Average = 24
Answer: B
