Answer:
Step-by-step explanation:
If the population ratio of A : B is 3 : 1, then state A has 3/(3+1) = 3/4 of the 336 thousand Native Americans.
(3/4) × 336 thousand = 252 thousand . . . . in state A
State B has the remaining amount:
(1/4) × 336 thousand = 84 thousand . . . . in state B