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GRE Prep Club Team Member
Joined: 20 Feb 2017
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The number m is the average (arithmetic mean) of the positive numbers
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31 Mar 2021, 22:21
31 Mar 2021, 22:21
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Question Stats:
42% (02:37) correct
57% (02:17) wrong based on 7 sessions
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The number m is the average (arithmetic mean) of the positive numbers a and b. If m is 75% more than a, then m must be
A. 30% less than b
B. \(42 \frac{6}{7}\)% less than b
C. 50% less than b
D. \(66 \frac{2}{3}\)% less than b
E. 75% less than b
A. 30% less than b
B. \(42 \frac{6}{7}\)% less than b
C. 50% less than b
D. \(66 \frac{2}{3}\)% less than b
E. 75% less than b
The number m is the average (arithmetic mean) of the positive numbers
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01 Apr 2021, 07:35
01 Apr 2021, 07:35
3
m = \(\frac{a+b}{2}\) _________ Eq (1)
m = \(1.75a\) :: a = \(\frac{4}{7}\)m
By putting value of \(a\) in eq .... (1)
2m = \(\frac{4m + 7b}{7}\)
14m = 4m + 7b
10m = 7b
m = 0.7b
Answer A
m = \(1.75a\) :: a = \(\frac{4}{7}\)m
By putting value of \(a\) in eq .... (1)
2m = \(\frac{4m + 7b}{7}\)
14m = 4m + 7b
10m = 7b
m = 0.7b
Answer A
Re: The number m is the average (arithmetic mean) of the positive numbers
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01 Apr 2021, 11:31
01 Apr 2021, 11:31
1
(a + b) / 2 = m
a + b = 2m
As, m is 75% more than a. Let, a = 10, so m = 17.5
Now, a + b = 2m
10 + b = 2 * 17.5
10 + b = 35
b = 25
SO, m is less than b by (25 - 17.5) / 25 = 30 %
a + b = 2m
As, m is 75% more than a. Let, a = 10, so m = 17.5
Now, a + b = 2m
10 + b = 2 * 17.5
10 + b = 35
b = 25
SO, m is less than b by (25 - 17.5) / 25 = 30 %
