Notam:
x = ture efectuate de Bogdan
y = ture efectuate deCorina
9 × x = A
12 × y = A
A este c.m.m.m.c al numerelor 9 si 12
9 = 3^2
12 = 2^2 × 3
-------------------
c.m.m.m.c = 2^2 × 3^2 = 4×9 = 36
deci,
9 × x = 36
x = 36 : 9 = 4 (ture face Bogdan)
12 × y = 36
y = 36 : 12 = 3 (ture face Corina)