Răspuns :
a - b = 200 × 2
a - b = 400
a = 5b
5b - b = 400
4b = 400
b = 400 : 4
b = 100
a = 100 × 5
a = 500
a |-----|-----|-----|-----|-----|
b |-----|
Diferența=200×2=400
b=400:4
b=100
a=100×5
a=500
Verificare: 500:100=5
500-100=400=200×2
b |-----|
Diferența=200×2=400
b=400:4
b=100
a=100×5
a=500
Verificare: 500:100=5
500-100=400=200×2