shakunthala devi puzzles A farmer has C chickens.

A farmer has C chickens.

A sack of feed comes for 9 days.As the feed
cost is increasing the
farmer sells some chickens and retains 12 chicken.If he reduces the
feed quantity by 10% .Then
he observesthat the feed comes for 30 days.What is C?
sol:
C chickens can b fed for 9 days.so C chick can eat 1/9 in 1 day.
so 1 chick can eat (1/9C)in one day.
after his reduction one chick gets to eat only 90% of wht it used to
eat in one day.
so new feed value=0.9*(1/9C)for 1day.but now he has only 12 chicks.
that means as per new rule feed is suitable for 12 chicks for 30 days.
i.e.
0.9*(1/9C)*12*30=1. solve to get C=36

Ans:36