John weighs twice as much as Susan. Susan's weight is 60% of

This question requires no algebra, just a parsing of the text.

0---------|Susan|---------|Sam|--|Max|--|John|------------------|Susan|.

John weighs twice as much as Susan. Self explanatory.
Susan's weight is 60% of Sam's weight. This means Sam weighs more than Susan, but less than John, because Susan is 50% of John's weight. (1/.6 = 5/3 = 1.66%. This means Sam weights 1.6 times Susan, which is less than 2).
Mark weighs 50% of Lynn's weight. Let's come back to this.
Lynn weighs 190% of John's weight. We can approximate 190% to be almost twice as much, so Lynn weighs almost twice as much as John. Now, Mark weighs half of Lynn, so a little bit less than John.

We don't know the exact relation between Max and Sam, but it doesn't matter because we still know that Susan is much less than all of them.

Answer: B

ANOTHER APPROACH:

Just use POE.

John weighs twice as much as Susan. John weighs more than Susan - eliminate.
Susan's weight is 60% of Sam's weight. Sam weighs more than Susan - eliminate.
Mark weighs 50% of Lynn's weight. Wait on this one.
Lynn weighs 190% of John's weight. Lynn weighs more than John. Eliminate Susan.

Now we've narrowed down our potential solutions to 2 just by reading the options. We have either Susan or Mark. Now - Susan weighs almost twice as much as John, and Mark weighs half of Lynn, so Mark and John weigh very close to one another. John however is twice as much as Susan. So Susan still weighs considerably less.

Answer: B

Thought i will share an easy way that i found

Take John's weight as 100

J=100
So Lynn = 190
Mark = 95
Susan = 50
Sam = 500/6


Lowest is Susan

Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.