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# The average height of the girls in a certain class is 160cm and averag

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Intern
Joined: 04 Feb 2018
Posts: 10
Location: India
The average height of the girls in a certain class is 160cm and averag  [#permalink]

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Updated on: 02 Oct 2018, 02:34
1
1
00:00

Difficulty:

45% (medium)

Question Stats:

63% (01:17) correct 37% (01:15) wrong based on 64 sessions

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The average height of the girls in a certain class is 160cm and average height of all the children in the class is 164cm. What is the ratio of the number of girls to the number of boys in the class?

(1) The number of girls in the class is 15.
(2) The average height of boys in the class is 170cm.

Originally posted by rheabiswal on 02 Oct 2018, 02:33.
Last edited by Bunuel on 02 Oct 2018, 02:34, edited 1 time in total.
Renamed the topic and edited the question.
Math Expert
Joined: 02 Aug 2009
Posts: 8326
Re: The average height of the girls in a certain class is 160cm and averag  [#permalink]

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02 Oct 2018, 03:30
The average height of the girls in a certain class is 160cm and average height of all the children in the class is 164cm. What is the ratio of the number of girls to the number of boys in the class?

(1) The number of girls in the class is 15.
We do not know the number of boys..
Insufficient

(2) The average height of boys in the class is 170cm.
We can use weighted average method to get the answer..
160....164......170
G:B=(170-164):(164-160)= 6:4=3:2
Sufficient

B
_________________
Re: The average height of the girls in a certain class is 160cm and averag   [#permalink] 02 Oct 2018, 03:30
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