In a stable there are men and horses. In all, there are 22 heads and 72 feet. How many men and how many horses are in the stable?
14 horses and 8 men. 14x4 plus 8x2 = 72 feet.
Bạn thử chứng minh "3n = 4 với mọi n" thử xem nào?
3n = Ba n
4 = Bốn = Bố n