Question

Aflati 2 nr rationale care au suma 27 si raportul 4/5.

Answer 1

a+b=27=> a=27-b
a/b=4/5
5a=4b
5(27-b)=4b
135-5b=4b
135=9b
b=15
a=27-15
a=12

Answer 2

a+b=27;
a/b=4/5⇒5a=4b⇒b=5a/4;
⇒a+5a/4=27
⇒4a/4+5a/4=27
⇒9a/4=27
⇒a=4·27/9
⇒a=4·3
⇒a=12;
⇒b=5·12/4
⇒b=5·3
⇒b=15;