Question

Aflati nr. a,b,c, stiind ca a+b = c,a-b = b si b +c = 32

Answer 1

a+b=c
a-b=b  ⇒ a=2b;   ⇒ 2b+b=c;  c=3b
b+c=32

b+3b=32
4b=32
b=8

a=2b
a=16

c=3b
c=24

Answer 2

a+b= c 
a-b= b ⇒ a= 2b ⇒ 2b+b= c ⇒ c= 3b
b+c= 32
____________
a= ? 
b= ? 
c= ?
____________
b+c= 32
b+3b= 32
4b= 32
b= 32:4
b= 8

a= 2b
a= 2·8
a= 16

c= 3b
c= 3·8
c= 24

\weskizq