Antonia and carla have the same percentage of green marbles in their bags of marbles. antonia has 4 green marbles and 16 total marbles. carla has 10 green marbles. how many of carla's marbles are not green?
a-10
b-20
c-25
d-30

We know that 4x4 is 16, so that's where we start. 16 is represented by 100%, and 25 goes into 100 four times, so 4 marbles is 25% of Antonia's total marbles. Therefore, the remaining percent of Carla's (75%) are what we're looking for. If 10 is 25%, then 10x4 is Cala's total amount of marbles - 40. Then, we subtract the amount that are green from the total, which is 40-10. We are left with 30.

So, 30 of Carla's marbles are not green.

Hope I helped!