Răspuns :
Fie a, b cele doua nr..
a - b = 900
a / 5 = 1 / 2 b
a = 900 + b
(900 + b) : 5 = b : 2, (900 + b) · 2 = 5b, 1800 + 2b = 5b, 1800 = 5b - 2b,
1800 = 3b, b = 1800 : 3, deci b = 600.
Iar a = 900 + 600, deci a = 1500.
a - b = 900
a / 5 = 1 / 2 b
a = 900 + b
(900 + b) : 5 = b : 2, (900 + b) · 2 = 5b, 1800 + 2b = 5b, 1800 = 5b - 2b,
1800 = 3b, b = 1800 : 3, deci b = 600.
Iar a = 900 + 600, deci a = 1500.