## 216. Math Puzzle $5 / 83$

Three brothers aged 7, 12, and 15 have a total of 10 marks pocket money per week. The youngest receives 10 percent. The 12-year-old gets half of what the oldest receives.

How much money does each of the three boys have?
The youngest brother received 1 Mark; the second received half of the older one $=3$ Marks; the oldest got 6 Marks.