Identify the hidden meaning behind this picture?

Some friends went on a vacation to a resort. It was raining heavily and it kept raining for thirteen days.

When it rained in the morning, the afternoon was beautiful and when it rained in the afternoon, the day was blessed with a clear morning.

Overall, the friends experienced eleven nice mornings and twelve nice afternoons. Can you find out the number of days they spent on vacation?

What building has the most stories?

What is the centre of gravity?

People make me, save me, change me, raise me. What am I?

What is the fastest way to double your money?

If you remove one from eleven, it becomes ten. If you remove one from nine, it becomes ten.

How is this possible?

The centre of the third figure is empty. What digit should fit inside?

Replace the (?) with the correct mathematical signs to make the expression equal to 59.

18 ? 12 ? 4 ? 5 = 59

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