Răspuns :
f = 8
[tex]b = f*5 == > b = 8*5 == > b = 40 \\ f + b = 8 + 40 == > f + b = 48 [/tex]
[tex]b = f*5 == > b = 8*5 == > b = 40 \\ f + b = 8 + 40 == > f + b = 48 [/tex]