i have variables A,B,C,D,E, which C and D's calculations depends on the
values of A and B. E = C/D.

Now i have a column of different A values and I need to evaluate for each A,
what is the corresponding E value.
sample table:

Values A E
A = 10 15 corresponding value to A = 15
B = 20 20 corresponding value to A = 20
C = function of A & B. 25 "
D = function of A & B. 30 "
E= C/D 35 "
40 "

is there a way I can edit the formula for E values in the 3rd column to drag
down for each corresponding value of A?