Răspuns :
a + b = 125
a = 25b⁽²⁵/100
a = b/4
b/4 + ⁴⁾b = ⁴⁾125
b + 4b = 500
b = 500 : 5
b = 100 timbre
a = 125 - 100
a = 25 timbre
a = 25b⁽²⁵/100
a = b/4
b/4 + ⁴⁾b = ⁴⁾125
b + 4b = 500
b = 500 : 5
b = 100 timbre
a = 125 - 100
a = 25 timbre