the expression 1/12 / (1/4 + 5/12) is equivalent to
a - 1/18
b - 7/12
c - 1/8
d - 1/2
1/4= 3/12
3/12 + 5/12= 8/12
1/12 / 8/12 =
1/12 x 12/8
12/96=1/8
c-1/8
a - 1/18
b - 7/12
c - 1/8
d - 1/2
1/4= 3/12
3/12 + 5/12= 8/12
1/12 / 8/12 =
1/12 x 12/8
12/96=1/8
c-1/8