A * B means A and B are of the same age;
A - B means B is younger than A;
A + B means A is younger than B; Sachin * Madan - Reena means

Answer: A. Reena is the youngest.

Sachin * Madan - Reena means Sachin and Madan are of the same age and Reena is younger than Madan. This means that Reena is the youngest.