Please find Anurag's response here: http://www.beatthegmat.com/a-median-of- ... 79428.html

Find the number of cubes required to erect a pillar of volume 20 m3? I. The edge of the cube is 0.5 m. Case 1: Let the base of the pillar be made with one such cube. Volume of the pillar = Area of base * Height = 0.5*0.5*0.5*hn = 20 n = 20*8 = 160. Case 2: Let the base of the pillar be made with two...

In a game, three groups of students (A, B and C) in a class have averaged scores of -4, 0.5 and 20 respectively. The class average is 2. Group A and B account for what proportion of the entire student population? Let the number of people in groups A,B,C be A,B,C. So, -4*A + 0.5*B + 20*C = 2*A + 2*B ...

Great explanation! Ta

Is x^4 + y^4 > z^4? A x^2 + y^2.> z^2 Case 1: If x = 100, y = 100 and z = 0. Then x^2 + y^2.> z^2 (2*100^2 > 0) and x^4 + y^4 > z^4 (2*100^4 > 0). Case 2: If x = 4, y = 4 and z = 5 x^2 + y^2.> z^2 (32 > 25) and x^4 + y^4 < z^4 (512 < 625). Since we don't have a definite answer, Statement I is insuff...

Please check Stuart's response here - http://www.beatthegmat.com/median-question-t8140.html

Q) If @ represents one of the operators +,- and * , is k@(l+m)=(k@l)+(k@m) for all numbers k,l and m ? 1)k@1 is not equal to 1@k for some number k. Let @ be *, then k*1 = 1*k. So, @ can't be *. Let @ be +, then k+1 = 1+k. So, @ can't be +. Let @ be -, then k-1 != 1-k(not always). So, @ is '-'. and t...