jika diketahui x : y=2:5 dan y=15 maka tentukan nilai x + y

x : y = 2 : 5
y = 15
x = 2/5 × 15 = 6
x + y = 6 + 15 = 21

x/y = 2/5
x/15 = 2/5
5x = 15 . 2
x = 30/5
x = 6

y = 15
x = 6

x + y = 15 + 6 = 21

maaf kalo salah