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# The average weight of a class of 44 students is 36kgs. If

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Director
Joined: 16 Jun 2004
Posts: 893
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The average weight of a class of 44 students is 36kgs. If [#permalink]  09 Sep 2004, 00:43
The average weight of a class of 44 students is 36kgs. If the weight of the teacher is included, then the average weight of the class increases by 1kg. What is the weight of the teacher?

A. 37kgs
B. 81kgs
C. 73kgs
D. 63kgs
E. 45kgs
GMAT Club Legend
Joined: 07 Jul 2004
Posts: 5079
Location: Singapore
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Total weight of 44 students = 1584kg

If the ave weight increases by 1kg, it becomes 37kg
Total weight of 44 students and 1 teacher = 37*45 = 1665

So weight of teacher = 81kg
Manager
Joined: 02 Apr 2004
Posts: 224
Location: Utrecht
Followers: 1

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Yes, I have B as answer too.

44*36 + 1*x / 45 = 37
1584 + x / 45 = 37

45*37 = 1665

1665 - 1584 = 81 kilograms.

Regards,

Alex
Manager
Joined: 28 Jul 2004
Posts: 54
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its 81
way 2 easy guys
_________________

Jim

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