Daniel bought some sweets. He gave 1/2 of the sweets to his brother and 1/3 of

the remainder to his sister. He then shared the rest of the sweets with 3 of his
friends. If each of his friends received 8 sweets, how many sweets did Daniel buy
altogether?

The knowledge of this question is simple calculation.

1 - 1/2 = 1/2
1/2 - 1/2 * 1/3 = 2/6
2/6 / 3 = 1/9
8 / 1/9 = 72

72 sweets