Nilai X + Y pada gambar adalah...

3/5 = 5/5+y
3 (5+y) = 25
15 + 3y = 25
3y = 25 - 15
3y = 10
y = 3,33cm

3/5 = 4/4+x
3 (4+x) = 20
12 + 3x = 20
3x = 20 - 12
3x = 8
x = 2,67cm

jadi x + y = 3,33 + 2,67 = 6cm