suhpra wrote:I want to re-open the thread as my understanding is different from the others.
I thought this way X-Y = those who like BS but dislike LB
where X= all those ppl who like BS and Y= all those who dislike LB
So we know that X= 32 [Like BS but dislike LB] + ? [Like BS and like LB]
So, I would expect the answer to be X-80. And since, we do not know how many among those who Like LM, Like BS, X can not be known.
Can anyone please help me out!
Thanks in advance.
whoa, no, you can't do that.
here's an analogy for why not:
let's say that, in an auditorium, there are 10 people from fresno, california.
now let's say that the same auditorium contains 40 people who don't play football.
according to your reasoning above, then, the number of people from fresno who do
play football would be ... negative 30.
so you can see why that wouldn't work.
the easiest way for you to see which quantities legitimately do
add and subtract is to construct a double set matrix
(see our word translations strategy guide, if you don't know what that is), and then just look carefully at the headings on the rows and columns, all of which are additive.
if you do that, you will discover that the correct subtraction is
(like B but dislike L)
= (ALL who like B) - (like B and like