Question

produsul a 2 nr este 672.marind unul dintre ele cu 20 , produsul va deveni 992. determinati cele 2 nr naturale.

Answer 1

 a*b=672 si

(a+20)*b=992   <=> a*b + 20*b = 992                    

                                 20*b = 992-672

                                      b = 320:20

                                      b = 16  => a = 672:16 = 42 .

Answer 2

a×b=672
(a+20)×b=992
ab+20b=992
672+20b=992
20b=992-672
20b=320
b=320÷20
b=16
a×16=672
a=672÷16
a=42
R: a=42 ; b=16
verificare
42×16=672