a + b = 1230
a : 3 = b : 7 ==> 7×a = 3×b
a |___|___|___|
b |___|___|___|___|___|___|___|
Avem 10 segmente egale = 1230
1230 : 10 = 123 (un segment egal)
a = 3 × 123 = 369
b = 7 × 123 =861
Verificare:
369 + 861 = 1230
369 : 3 = 861 : 7
123 = 123 (adevarat)