nobody is answering my questions anymore please help me I need help

Answer:
see below
Step-by-step explanation:
The ratio is 20/16 = 5/4
10/a = 5/4
Using cross products
10*4 = 5a
Divide each side by 5
40/5 = a
8 =a
9/b = 5/4
Using cross products
9*4 = 5b
36 = 5b
Divide each side by 5
36/5 =b
7.2 =b
12/c = 5/4
Using cross products
12*4 = 5c
48 = 5c
Divide each side by 5
48/5 = c
9.6 =c