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If a group of students having an average age of 17 years join a class,
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04 Jan 2024, 00:02
04 Jan 2024, 00:02
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57% (01:43) correct
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If a group of students having an average age of 17 years join a class, the average age of all the students in the class reduces from 20 years to 19 years.
A) Quantity A is greater.
B) Quantity B is greater.
C) The two quantities are equal.
D) The relationship cannot be determined from the information given.
Quantity A |
Quantity B |
Twice the number of students who joined the class |
The number of students initially present in the class |
A) Quantity A is greater.
B) Quantity B is greater.
C) The two quantities are equal.
D) The relationship cannot be determined from the information given.
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Free Materials for the GRE General Exam - Where to get it!!
GRE Geometry Formulas
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Free Materials for the GRE General Exam - Where to get it!!
GRE Geometry Formulas
GRE - Math Book
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Re: If a group of students having an average age of 17 years join a class,
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19 Jan 2024, 14:26
19 Jan 2024, 14:26
1
Let b = the # of students who joined the class, c = the # of students who were initially in the class.
20a = the total combined years of ages in the initial class
17x = the total combined years of ages in the group of students who joined
Given that the new average of all the students is 19:
\(\frac{{17x + 20a} }{ {x + a}} = 19\)
\(17x +20a = 19x +19x\)
\(a = 2x\)
20a = the total combined years of ages in the initial class
17x = the total combined years of ages in the group of students who joined
Given that the new average of all the students is 19:
\(\frac{{17x + 20a} }{ {x + a}} = 19\)
\(17x +20a = 19x +19x\)
\(a = 2x\)
gmatclubot
Re: If a group of students having an average age of 17 years join a class, [#permalink]
19 Jan 2024, 14:26
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