chemistry....please come

D,J,R,Y represent four different compounds. D and J react according to the following equations:

D + 2J －> R + 2Y

d grams of D react with j grams of J to give r grams of R and y grams of Y . What is the value of y??
A d + j - r
B d + 2j - r
C 2( d + j - r )
D ( d + 2j - r ) / 2