Question

Produsul a doua numere este672.Marind unul dintre nr cu 10,produsul devine992.Determinati cele doua numere

Answer 1

a*b=672
(a+10)*b=992

ab+10b=992=>672+10b=992=>10b=992-672=320=>b=320/10=>b=32
a*b =  672   
a*32=672=>a=672/32=21    

Answer 2

a * b = 672  si  (a+10) * b = 992 
                           [tex]\downarrow\\
a\cdot{b}+10b=992\\
\rightarrow\;\;672+10b=992\;\;10b=992-672\;;\;\;10b=320\;\;deci\;\;\fbox{b=32}\\ a\cdot32=672\;\rightarrow\;\;\fbox{a=21}[/tex]