Răspuns :
a - b = 900
a = 4b
4b - b = 900
3b = 900
b = 900/3
b = 300
a = 4*300
a= 1200
1200 - 300 = 900
1200/300 = 4
a = 4b
4b - b = 900
3b = 900
b = 900/3
b = 300
a = 4*300
a= 1200
1200 - 300 = 900
1200/300 = 4
a-b=900 |=> 4b -b = 900 =>
a=4b |=>3b=900=>b=900:3=>b=300
a=4b=>a = 4 * 300 => a=1200
a=4b |=>3b=900=>b=900:3=>b=300
a=4b=>a = 4 * 300 => a=1200