AAKASH AITS ( FUNCTION )

ANS...B
SOLVE 3X+4=4[X-3]
X=16

Y=52......X-Y=-36

Ans B
(y - 4)/3 = [x] and y/4 = [x-3]
so by the abv two equations it can be concluded that y is an integer and a multiple of 4..and y-4/3 is also an integer..
so the probable values of x and y
y = 16 4 < x < 5
y = 28 8 < x < 9
y = 40 12 < x < 13
y = 52 16 < x < 17..
so the fourth value
y = 52 16 < x < 17
satisfy both the equation simultaneously
so [x - y] = -36

THNKS GOVIND NICE EXPLANATION......

You can compress the numbers of steps.

4[x-3] = 4([x]-3) = 4[x]-12. So [x] = 16. and so on.

THNKS. SIR.