Hi All,

This question can be solved by TESTing VALUES.

We're given two pieces of information to work with:

1) The average weight of the women in a room is 120 pounds

2) The average weight of the men that same room is 150 pounds

We're asked for the average weight of ALL the people in that room.

Fact 1: There are twice as many men as women in the room.

With this ratio, we can prove that the average weight is always the same. Here's how...

IF we had....

2 men and 1 woman

the average would be [2(150)+1(120)]/3 = 420/3 = 140 pounds

4 men and 2 women

the average would be [4(150)+2(120)]/3 = 840/6 = 140 pounds

6 men and 3 women

the average would be [6(150)+3(120)]/9 = 1260/9 = 140 pounds

The average is ALWAYS 140 pounds.

Fact 1 is SUFFICIENT

Fact 2: There are a total of 120 people in the room.

The average will vary depending on how many men and women are in the room...

IF we had....

60 men and 60 women

the average would be exactly 'in the middle' = 135 pounds

61 men and 59 women

the average would be something other than 135 pounds

Fact 2 is INSUFFICIENT

Final Answer:

GMAT assassins aren't born, they're made,

Rich

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