Complete the following series. It.s very logical:

1, 4, 5, 6, 7, 9, 11, __?

Take away my first letter, then take away my second letter. Then take away the rest of my letters, yet I remain the same. What am I?

I have four wings but can't fly.
I express no emotions.
I am found on the exact spot every time you look.
I keep toiling away with a little sound.

Do you know what am I?

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

John was driving a bus and got stuck when passing through an underpass. Then came Jacob with a needle and got the bus out of the underpass.

What did the boy do?

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 ?

Can you find the odd number in the following?

2716, 4135, 5321 and 7145

John replied, when asked how old he was. In 2 years he will be twice as old as he was five years ago.' How old is he ?

I am never scared but became petrified and can’t live in a house but would die to make one. What am I?

In the city of Brain Teasers, 5% of people do not list their phone numbers. Now if we select random 100 people from the phone directory, then how many people selected will have unlisted phone numbers?