Question

aflati numerele a si b, stiind ca raportul lor este egal cu 3 supra 5, iar 2a+3b=42

Answer 1

a/b=3/5=>5a=3b
2a+3b=42
2a+5a=42=>a=42:7=>a=6
12+3b=42=>3b=42-12=>b=3:3=>b=10

Answer 2

a/b=3/5
a=3b/5
2•3b/5 + 3b=42
6b/5+3b=42
6b/5+15b/5= 42
21b/5=42
21b=210
b=210:21
b=10
a= 3•b/5
a=3•10/5
a=30/5
a=6
proba:
2•6+3•10=42
12+30=42
42=42