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Ani = A
Budi = B
A = 1/3 B -->persamaan 1
A+15000 = 2/3 (B+15000) -->persamaan 2
substisusi
1/3 B + 15000 = 2/3 (B + 15000)
B + 45000 = 2B + 30000
B = 15000
A = 1/3 (15000) = 5000
maka uang mula-mula ani adalah Rp5000 dan uang mula-mula budi adalah Rp15000