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j+s=110
r+s=50
j=4r
jawab:
j+s=110
4r+s=110
r+s=50_
3r=60
r=20
r+s=50
s=50-r=50-20=30
j=4.r=4.20=80
Jadi uang yg didonasikan oleh Jim $80, Siti $30 dan Roy $20
*MAAF YA KLO SALAH*.............