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# the average grade of students in Group A is 4. the average

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CEO
Joined: 21 Jan 2007
Posts: 2764
Location: New York City
Followers: 9

Kudos [?]: 354 [0], given: 4

the average grade of students in Group A is 4. the average [#permalink]  07 Nov 2007, 12:55
the average grade of students in Group A is 4.
the average grade of students in Group B is 3.
If the groups were merged into one group, what is the average of the group?

1. there are twice as many students in group1 as in group 2
2. There are 4 more students in group 2 than group 1.
Senior Manager
Joined: 01 Sep 2006
Posts: 302
Location: Phoenix, AZ, USA
Followers: 1

Kudos [?]: 15 [0], given: 0

Re: combining averages [#permalink]  07 Nov 2007, 14:37
bmwhype2 wrote:
the average grade of students in Group A is 4.
the average grade of students in Group B is 3.
If the groups were merged into one group, what is the average of the group?

1. there are twice as many students in group1 as in group 2
2. There are 4 more students in group 2 than group 1.

Useing 1 Assume group 2 has 1 student then group 1 has 2 students
new avg = (4*2+3*1)/3 Suff

Using 2 B-A=4 insuff we need to some how know the ratio of people in A and B

Answe A
CEO
Joined: 21 Jan 2007
Posts: 2764
Location: New York City
Followers: 9

Kudos [?]: 354 [0], given: 4

fairly easy.

merged avg = s1+s2 / n1+n2

OA is A
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