I'd say option b, you can learn why by isolating x.
        
             
        
        
        
Answer:
Ryan 113, Alex 101
Step-by-step explanation:
Ryan beats Alex by 12 points
101+101=202
202+12=214
113+101=214
 
        
             
        
        
        
Answer:
$36.000
Step-by-step explanation:
Beca total = 60.000
1/5 parte = 12.000
Gasta 2/5 partes lo que son 24.000
Le quedan 36.000 para otros gastos 
 
        
             
        
        
        
Step-by-step explanation:
conditions : x≠0 and x≠-a and b≠1
1/(x+a) = b/x ⇌ 1×x = b(x+a) ⇌ x = bx + ba ⇌ (1-b)x = ab ⇌ x = ab/(1-b)