Make a the subject. 3w + 20/200 = A/A+12

Question

this got me confused for so long! Please help and solve it for me thank you.

Answer 1

 

Interpreting .A/A = 0.1A/A:

 

 

3w + 20/200 = 0.1A/A + 1/12

 

3w + 1/10 = 1/10 + 1/12

 

3w = 1/12

 

w = 1/36

 

 

 

Interpreting .A/A = A/A = 1:

 

3w + 20/200 = A/A + 1/12

 

3w + 1/10 = 1 + 1/12

 

3w + 1/10 = 13/12

 

3w = 13/12 - 1/10

 

3w = (130 - 12)/120 = 118/120 = 59/60

 

w = 59/180