Using four sevens (7) and a one (1) create the number 100. Except for the five numerals, you can use the usual mathematical operations (+, -, x, :), root and brackets ()

Why do people go to bed?

What does this below rebus puzzle mean?

Which statement is true out of the following?
One statement here is false.
Two statements here are false.
Three statements here are false.

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?

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

1 dollar = 100 cent
= 10 cent x 10 cent
= 1/10 dollar x 1/10 dollar
= 1/100 dollar
= 1 cent

=> 1 dollar = 1 cent

solve this tricky problem?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

Can you solve the below tricky visual equation?

Two prisoners Jack and Jill are locked in a cell.
There is open window approx 40 feet above the ground of the cell.
They are never able to reach there.

Then they plan to escape by a tunnel and they start digging out.
After digging for more than 20 days, Jill comes with the different plan and they escaped.

what was the plan ?