tolong jwb yg no 10...pakai jalan....

Kelas 7 Matematika
Bab Perbandinga dan Aritmatika Sosial

Fandi = f
Rina = r

(f - 2) = 6 (r - 2)
f - 2 = 6r - 12
f = 6r - 12 + 2
f = 6r - 10

(f + 18) = 2 (r + 18)
6r - 10 + 18 = 2r + 36
6r - 2r = 36 - 8
4r = 28
r = 7 

f = 6r - 10
f = 6 . 7 - 10
f = 42 - 10
f = 32

f + r
= 32 + 7
= 39 tahun