If the December number is 15% greater than the January number, we cannot also conclude that the January number is 15% less than the December number. To illustrate this, let's look at a different example. A = 100 B = 150 Notice that B is 50% greater than A. HOWEVER, A is not 50% less than B. In fact...

GMAT = Twisted maths?

Isn't it true that 460 - 15% = 391? In question 57 of OG 13 it says that Company P had 15% more employees in December than in January. In December they had 460 employers, how many employees did they have in January? I used the formula Now=(1-change/100)original Apparently, answer is B, which contrad...

Properties of Numbers - Exponents

Hi, I've come across this question on OG which I can't make sense of: If r, s and t are nonzero integers, is r^5s^3t^4 negative? (1) rt is negative (2) s is negative I got it right when working out that both alone were not sufficient. However, I assumed the statements together would be sufficient as...