If it took eight men ten hours to build a wall, how long would it take four men to build it?

One day, all the courtiers from Akbar's court were gathered in the assembly hall when one of them told the Emperor that all his valuables had been stolen by a thief the previous night.
This shocked the Emperor to his core as the place where that courter stayed was the most secured in the kingdom. The Emperor thought that it is not at all possible for an outsider to enter into the courtier's house and steal the valuables. Only another courtier could commit this crime. He quickly called Birbal to identify the thief.
Birbal thought for a while and successfully solved the mystery by identifying the thief in just one statement.
What did Birbal say?

Can you solve the below tricky visual equation?

Spelt forwards I’m what you do every day, spelled backwards I’m something you hate. What am I?

What has no start, end, or centre?

What's the next in the series?

H, Be, F, S, Mn, Kr, In, Gd, Tl, ?

If an electric train is travelling south, then which way is the smoke going?

What time is it when an elephant sits on a fence?

Can you write down eight eights so that they add up to one thousand?

In a basket of apples,
when counted in twos, there was one extra
when counted in threes, there were two extra when counted in fours, there were three extra
when counted in fives, there were four extra
when counted in sixes, there was five extra.

However, if the apples were counted in sevens, no extra apple was left. Can you calculate the minimum number of apples that were present in the basket?