Step-by-step explanation:
Assuming there are no other parts,
the Whole = A + B is the denominator:
Whole = 2 + 1 = 3
Part A = 2 and Part B = 1 are numerators for each fraction.
The fractions are then:
2/3 and 1/3
Meaning:
Part A is 2/3 of the whole
Part B is 1/3 of the whole
