Notez numarul merelor cu ,, m '' si pere = ,, p ''
m = 3 × p
m - 4 = 4 × ( p - 4 ) ⇔ m = 4 × p - 16 + 4 ⇒ m = 4 × p - 12
4 × p - 12 = 3 × p
4 × p - 3 × p = 12
p = 12 ( pere )
m = 3 × 12 = 36 mere
Verific: 36 - 4 = 4 × ( 12 - 4 ) = 4 × 8 = 32 ( corect )