Question

a-b=15 a:b=4 care este dublul sumei celor doua nr

Answer 1

a:b=4 => a=4b
4b-b=15 => 3b=15 => b=15:3=5
a-5=15=> a=15+5 => a=20
a+b=20+5=25
2•(a+b)=2•25=50

Answer 2

a:b=4=>a=4b 4xb-b=15=>b=5 a=4x5=20 a+b=20+5=25 2x(a+b)=2x25=50