Find each sum. Express all answers in lowest terms/simplest form.
a. 3/20 + 2/5
b. 7/30 + 11/30
c. 10/15 + 4/15
d. 9/12 + 3/4
e. 5/6 + 4/10
f. 1 5/6 + 4 4/6
g. 3 2/8 + 6 1/3
h. 1 6/7 + 2 2/4
i. 5 3/11 + 2 5/11
j. 9 6/24 + 8 5/8