Tolong dijawab secepatnya ya ini or buat bsk :)

1. A : B = 2:3 = 2/3
B : A = 3:2 = 3/2 = 1 1/2

2. G/H = 7:4 = 7/4 = 1 3/4
H/G+H = 4 : 11 = 4/11

3. A/A+B = 3/8

4. 25 : 5/8
= 25 x 8/5
= 40

5. a = 8
b = 9-8
=1

a/b = 8/1
a/b = 8