A word problem involving marginal density, conditional density and proportion.

A tobacco company produces blends of tobacco with each blend containing various proportions of Turkish, domestic and other tobacco.
The proportion of Turkish and domestic in a blend are random variables (X = Turkish and Y = domestic) with joint density function

f (x,y) = { 24xy, 0 < or= x < or=1, 0 < or = y < or=1
                  x + y < or=1
            0,  elsewhere
A.  Find the marginal density for the proportion of the domestic tobacco.
B.   Find the conditional density of X given Y = 3/4
C.   Find the probability that the proportion of Turkish tobacco is less than 1/8, given that the blend contains 3/4 domestic tobacco

PLEASE SEE ATTACHED FILE FOR CLEARER, TYPED COPY OF THE QUESTION. THANKS!