Khi cùng bớt mỗi số 6 đơn vị thì tổng hai số sẽ còn:
260 - ( 6 x 2 ) = 248
Số bé khi bị bớt là:
248 : ( 3 + 1) = 62
Số bé ban đầu là:
62 + 6 = 68
Vậy số bé phải tìm là 68
thằng nào thông minh thì sẽ biết nó là
68
cau nay quen la 68 dung 10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000%