Can you solve the below tricky visual equation?

Can you find out what is missing?

1 3 5
2 4 ?

Hint: It's not six. Think out of the box.

Without looking at a calendar, within a minute name, a boy's name using 5 consecutive 1st letters of 5 consecutive months

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

There were three women in all the swimming costumes!
One was happy and the other two were sad!
The happy one was crying and the sad ones were smiling.
Why was this?

A number with an interesting property:

When I divide it by 2, the remainder is 1.
When I divide it by 3, the remainder is 2.
When I divide it by 4, the remainder is 3.
When I divide it by 5, the remainder is 4.
When I divide it by 6, the remainder is 5.
When I divide it by 7, the remainder is 6.
When I divide it by 8, the remainder is 7.
When I divide it by 9, the remainder is 8.
When I divide it by 10, the remainder is 9.

It's not a small number, but it's not really big, either.
When I looked for a smaller number with this property I couldn't find one.

Can you find it?

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

Replace the question mark with the correct number below.

They came out at night, without being called.
They lost at day, without being stolen.
Who are they?

Can you count the number of quadrilaterals in the picture below?