My answers are

1. C

2. C

3. B

4. C

5. B

6. D

Q1. I did this by normalising (Tuneman , you got it right)

From stmt 1

W:C=5:2

C:M=2:11

So

W:C:M=25:10:22 ( take LCM of 2 and 5)

This tells us # women has to be multiple of 25, but it does not give exact number so INSUFF

Stmt 2 W < 30 does not help INSUFF

Combning both we get W = 25

Q2.

From Stmt 1

We have 3Z < M

From Stmt 2

we have M < 4Z

Since we dont know if M and Z are +ve or -ve above are INSUFF individually

Combining

3Z < M < 4Z

Since 3Z < 4Z , Z has to be +ve

so M has to be +ve

and therefore M + Z has to be +ve

Q3.As explained by pi10t

Q4.

Stmt 1

4% of FRENCH = 16 therefore 100% of FRENCH = 25 * 16 = 400

Stmt 2

10% of JAPANESE = 16 therefore 100% of JAPANESE = 10 * 16 = 160

stmt 1 and 2 by itself is INSUFF, together SUFF

Q5.

Not sure about this one

This is what I did

Actually tried 4 cases

1. Both +ve : |X-Y|

= |X| -|Y|

2. Both -ve : |X-Y|

= |X| -|Y|

3. X -ve and Y +ve : |X-Y|

> |X| -|Y|

4. X +ve and Y -ve : |X-Y|

> |X| -|Y| Modified the equality sign here

So if we know the signs we can answer the question.

As you see

Stmt 1 does not tell us about sign

While

Stmt 2 tells us that atleast one of them has to be -ve; So case 3 and 4 above indicates LHS > RHS

Q6.

http://www.gmatclub.com/phpbb/viewtopic.php?t=39492