Answer:
Part A is 3/8 of the whole
Part B is 5/8 of the whole
Solution:
Assuming there are no other parts,
the Whole = A + B is the denominator:
Whole = 3 + 5 = 8
Part A = 3 and Part B = 5 are numerators for each fraction.
The fractions are then:
3/8 and 5/8
Meaning:
Part A is 3/8 of the whole
Part B is 5/8 of the whole