The problem asks us to determine which of the four friends gets an extra pizza piece based on their relative ages.
The rule is that the oldest friend gets an extra piece of pizza. We need to compare the ages of Bahu, Kattappa, Bhalla, and Devsena.
Let's analyze the given age differences relative to Kattappa:
By comparing the age differences relative to Kattappa:
Comparing these differences ($+3$ months, $+2$ months, $+1$ month), Bhalla is older than both Bahu and Devsena. Since Kattappa is the youngest reference point, Bhalla is the oldest among the four friends.
As Bhalla is the oldest friend, he gets the extra piece of pizza according to their decision.
Each of P, Q, R, S, T, U and V has an exam on a different day of a week, starting from Monday and ending on Sunday of the same week. U has an exam on Friday. Only 2 people have exams between U and R. V has an exam immediately before Q and T has an exam immediately after S. Only 2 people have exams between P and Q. Who has an exam on Sunday?