I have branches, but no fruit, trunk or leaves. What am I?

In a boat, the father of a sailor's son is sitting with the son of the sailor. However, the sailor is not present on the boat.

Can this even be possible?

I have lakes with no water, mountains with no stone and cities with no buildings. What am I?

You are given four results as below:
1111 = F
2222 = E
3333 = T
Then, can you find out how to code 4444?

Which tank will fill first?

What does the following represent?

N N N N N N N

A A A A A A A

C C C C C C C

Look at this sequence from top to bottom. What is the next number in the sequence?
1
11
21
1211
111221
312211

Four people need to cross a rickety bridge at night. Unfortunately, they have only one torch and the bridge is too dangerous to cross without one. The bridge is only strong enough to support two people at a time. Not all people take the same time to cross the bridge. Times for each person: 1 min, 2 mins, 7 mins and 10 mins. What is the shortest time needed for all four of them to cross the bridge?

What word does this rebus represent?

meta meta
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Find the next number in the series below

21 32 54 87 131 ?