In which direction should the missing arrow point?

I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?

Two friends decide to get together; so they start riding bikes towards each other. They plan to meet halfway. Each is riding at 6 MPH. They live 36 miles apart. One of them has a pet carrier pigeon and it starts flying the instant the friends start traveling. The pigeon flies back and forth at 18 MPH between the 2 friends until the friends meet.

How many miles does the pigeon travel?

Solve the following series:
AZ, GT, MN, __, YB

Nine marbles are arranged in the image below. Can you slide two marbles to form a square?

In the given picture, in how many ways can you read the word "Tiger"?

Name a key which is hardest to turn.

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?

Can you find out which triangle will have a bigger area among the following?
1. A triangle with sides 300, 400 and 500
2. A triangle with sides 300, 400 and 700

I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?