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If the average of 10, 20, m, and n is 50, the average of m and n is (
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18 Jun 2022, 01:00
18 Jun 2022, 01:00
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If the average of 10, 20, m, and n is 50, the average of m and n is
(A) 65
(B) 70
(C) 80
(D) 85
(E) 95
(A) 65
(B) 70
(C) 80
(D) 85
(E) 95
Part of the project: Skill Builder Project
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GRE Math Essentials
GRE Geometry Formulas for a Q170
GRE - Math Book
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
GRE Math Essentials
GRE Geometry Formulas for a Q170
GRE - Math Book
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Joined: 02 Jan 2020
Status:GRE Quant Tutor
Posts: 1111
Given Kudos: 9
Location: India
Concentration: General Management
Schools: XLRI Jamshedpur, India - Class of 2014
GMAT 1: 700 Q51 V31
GPA: 2.8
WE:Engineering (Computer Software)
Re: If the average of 10, 20, m, and n is 50, the average of m and n is (
[#permalink]
18 Jun 2022, 10:12
18 Jun 2022, 10:12
1
Theory: Average = Sum of Values / Total no. of Values
Given that the average of 10, 20, m, and n is 50 and we need to find the average of m and n
Average of 10, 20, m and n = 50
=> \(\frac{10 + 20 + m + n }{ 4}\) = 50 [ Divided by 4 because there are 4 values 10, 20, m and n]
=> 30 + m + n = 50*4 = 200
=> m + n = 200 - 30 = 170
Average of m and n = \(\frac{m + n}{2}\) = \(\frac{170}{2}\) = 85
So, Answer will be D
Hope it helps!
Watch the following video to Learn the Basics of Statistics
Given that the average of 10, 20, m, and n is 50 and we need to find the average of m and n
Average of 10, 20, m and n = 50
=> \(\frac{10 + 20 + m + n }{ 4}\) = 50 [ Divided by 4 because there are 4 values 10, 20, m and n]
=> 30 + m + n = 50*4 = 200
=> m + n = 200 - 30 = 170
Average of m and n = \(\frac{m + n}{2}\) = \(\frac{170}{2}\) = 85
So, Answer will be D
Hope it helps!
Watch the following video to Learn the Basics of Statistics
gmatclubot
Re: If the average of 10, 20, m, and n is 50, the average of m and n is ( [#permalink]
18 Jun 2022, 10:12
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