Kak tolong bantu jawab soal ini ya.. Thx

misal :
apel = A
melon = M

A + M = 21.........(1)
A = 3 + M..........(2)

substitusi:
A+M = 21
3+M + M = 21
2M = 18
M = 9

A = 3 + M
A = 3 + 9
A = 11

Apel = 11
Melon = 9