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Bilangan yg kedua =y
x : y = 5 : 4
x/y = 5/4
x = 5y/4
Jika ditambah 5
(x+5) : (y+5) = 6 : 5
(x+5)/(y+5) = 6/5
5(x+5) = 6(y+5)
5x+25 = 6y + 30
5(5y/4) + 25 = 6y + 30
25y/4 + 25 = 6y + 30 (kali 4
25y + 100 = 24y + 120
25y - 24y = 120 - 100
y = 20
x = 5y/4 = 5(20)/4 = 5.5 = 25
Jadi bilangan itu adalah 25 dan 20
Semoga membantu :)