# Question on Math and Biology

Discussion in 'MCAT Study Question Q&A' started by Farcus, Jun 20, 2008.

1. ### Farcus

Joined:
Nov 28, 2007
Messages:
826
27
Status:
Pharmacist
If x is 200 percent more than y, then what
percent of x is y?

I don't understand though the reason behind this is since it says that "If x is 200% more than y, then x = y + 200%y. Since 100%
of y = y and 200% of y = 2y, we can say that x= y + 2y or x = 3y." But If its 200% more than would it be x=2y? how is it 3y?

Biology Section:
Can someone give me a definite rule behind natural selection and evolution and their difference? So far I know that evolution acts on population only, while NS is individual(not sure on that one). And that evolution is alleles based while NS is more phenotype centered. I just don't see their difference though apart from that. I mean according to darwin's evolution there is a selection forced from based on environment of the more favorable trait but isn't that just natural selection?

3. ### minhaj Awesomeness Incarnate

Joined:
Dec 3, 2007
Messages:
201
2
Status:
Medical Student
to answer your first question, x is 200% more than the original value of y. like in your equation, x = y + 2y(this is in addition to the y). i know it sounds confusing but i dont really know how to explain this better.

4. ### engineeredout

Joined:
May 11, 2008
Messages:
3,405
533
Status:
Resident [Any Field]
One hundred percent more would mean that it is double right? Lets say my chances of getting into medical school are 5 on the scale of life. If you had a 100% better chance than me, you'd have a 10. If you had 200% better than me it'd be a 15.

5. ### Farcus

Joined:
Nov 28, 2007
Messages:
826
27
Status:
Pharmacist
but I always thought 100% mean 1 so 200% = 2. like in a fraction, if something is 56% it is .56 and if its 100% it is 1.

Joined:
May 11, 2008
Messages:
3,405