Seems easy, I know, but apparently, the answer is incorrect all the time. Any help?

do the white circles multiplied by the white shapes to get the fraction of white circles:
3/10 = fraction of ratio of white circles
5/16 = ratio of white shapes
3/10 × 5/16 = 15/160 (white circles)
do the same for the black circles:
3/11 = ratio of black circles
11/16 = ratio of black shapes
3/11 × 11/16 = 33/176 (black circles)
then you must add these fractions together:
15/160 + 33/176
(to make this easier you can simplify them first)
3/32 + 3/16
multiply second fraction by 2 to get the lowest common denominator of 32
3/32 + 6/32
= 9/32
answer = 9/32 (total circles)