Good work! IMO 5+...also, the number of cities surveyed would help...we don't know how many cities were surveyed...the city could be ranked 14th out of 15.

@ spidy

Thank you! That was very stupid of me...I was wondering how mass was to be converted to volume!!!

X is greatest when Y = 0.

X = 4th root of 100, which is between 3 & 6

(you know x has to be greater than 3, because when x=3, x^4 = 81 and x can't be greater than 6. You only have one option then)

Researcher's Code

A researcher plans to identify each participant in a certain medical experiment with a code consisting of either a single letter or a pair of distinct letters written in alphabetical order. What is the least number of letters that can be used if there are 12 participants, and each participant is to ...

I guess this is a much simpler way to look at it...

5^21*4^11 = 2*10^n

5^21*2^22 = 2*2^n*5^n
5^21*2^21*2 = 5^n*2^n*2

hence, n = 21

I hope you guys understand!

Cheers!

Problem 1

Here is the link to solution to problem # 1

http://www.beatthegmat.com/stuck-on-thi ... t6439.html

Its a tricky one!