Question

a + 2 x b + 3 x c = 330
a + c = 70
a + b + 2 x v = ?
va rog, am nevoie repede!

Answer 1

a + 2 x b + 3 x c = 330;     a + c = 70 
a + 2 x b + 2 x c +  c = 330 
a + c + 2 x ( b + c )  = 330 
 70  + 2 x ( b + c ) = 330 
2 x ( b + c ) = 330 - 70 
b + c = 260 : 2 

b + c = 130 

a + b + 2 x c = a + b + c + c = ( a + c ) + ( b + c ) = 70 + 130 = 200