?Stupid Powerprep Problem.....?

[miaataro]

Originally Posted by julle286

Thanks!

But I still don't get why (r+t)/r = 1+(t/r) = 1+(p/r)*(t/p) ... ?

1. (r+t)/r = (r/r)+(t/r) = 1+(t/r)

2. t/r = (t/p)/(r/p) = (t/p)*(p/r)

3. p/r = 1/(r/p)

[chestnut.cc]

(p/r)/(p/t) = (3/5)/(9/10)... t/r = 2/3... r+t/r = 2+3/3... ie 5/3...D

[Makumajon]

Hi julle, you need to find (r+t)/r and are given something involving p, r, and t. So, let's first drive out p:
p/r=3/5 & p/t=9/10

Dividing the first ratio by the second,
(p/r)*(t/p)=(3/5)*(10/9)
=> t/r=2/3 (so, you need only +r in numerator. How about adding 1 to both sides?)

t/r+1=2/3+1
=> (t+r)/r=5/3. It's D.

[julle286]

Thank you!! I've got it now!

GRE is tomorrow. I need 760 in quant min.
People say 700 - 730 would be a "magical border" ... What do you think?

Well, let' see.

Do you think questions above are 760 level? What are your scores?

[miaataro]

Originally Posted by julle286

Thank you!! I've got it now!

GRE is tomorrow. I need 760 in quant min.
People say 700 - 730 would be a "magical border" ... What do you think?

Well, let' see.

Do you think questions above are 760 level? What are your scores?

I have no idea on the exact level of these questions but I guess they are, at least, not from the easiest end of the spectrum. However, I'm afraid that they are not the hardest either.

Good luck for tomorrow! I'll be taking GRE next week.