Also,

(x+y)^2 - (x-y)^2 = 2xy + 2xy =4xy
thus, 4xy => a^2 -b^2
i.e. 2xy = (a^2 - b^2)/2

answer is 181

let A be xy then B = yx
or A = 10x+y & B = 10y+x
so A+B must be a multiple of 11.
Hence only 181 doesn't fit the bill here.

Re: Rainy day

A contractor estimated that his 10-men crew could complete the construction in 110 days if there was no rain. (Assume the crew does not work on any rainy day and rain is the only factor that can deter the crew from working). However, after 5 days of rain, on the 61-st day, he hired 6 more people to...

even i thought it to be (B)
but, i wud go with logic of Sandman
answer should be (D).

please post the OA

is lxl+ lx-1l=1 1)x>=0 2)x<=1 together.....0 <= x <=1 For any value of x between 0 and 1 inclusive the expression lxl+ lx-1l will always result in 1 Sufficient. I Do not get it ....if lets say x=0.5 it would not result in 1 ! thanks parallel .....i detest absolute value questions :) if x = 0.5 l0.5...

yes..indeed OA's 5
Thanks, nikhil.
cn u plzz also explain what made you choose 5 over 3, as both were equally likely to me.

Difference between its and it's...please explain

Hello all, i am into my last phase of the prepn and not to mention that apart from my studies, tests, this forum is also been used extensively. i guess that i joined the forum very late. but, still am trying to get in the maximum info and brushing up my basics. Have one doubt nagging me, for long: w...

IMO: D when the average weight is 18, then 10 pound boxes = 6 20 pound boxes = 24 (easy to calculate) Nox, to reduce the average weight to 14, let total boxes be Y, then: 10 pound boxes = 6 20 pound boxes = Y - 6 thus, 10*6 + 20*(Y - 6) = 14*Y i.e. 60 + 20Y -120 = 14Y or 6Y = 60 thus, 10 pound boxes...