Overlapping figure ratio and proportion question

Hi all, i have this question would need your help to solve it .

thanks in advance !

I shall assume u mean circle A is left and circle B is on the right, although it doesn't really matter

2:7 => area of shaded to unshaded in Circle A is 2:5
3:7 => area of shaded to unshaded in Circle B is 3:4

2:5 => 6:15
3:4 => 6: 8

Hence, total unshaded proportion is 15+8 = 23

Answer is 6:23

the other question which i still puzzled how to solve it .thanks !

Area A is 2*2 - 1*1 = 3 cm²

Area B is 4 * 4 - 3*3 = 7 cm²

Hence, ratio of Area A to Area B is 3:7

the other question which i still puzzled how to solve it .thanks !

the area of shaded A is te 2nd smallest square minus smallest square

shaded B is largest square minus 2nd largest square.