Can you spot what's wrong with the following sentence?

PETER WAS ANGRY AT
HIMSELF BECAUSE HE
ACCIDENTALLY LEFT THE
THE KEYS TO HIS CAR
AT HIS FRIEND'S HOUSE.

You knock a Table over in the library, and suddenly 20 eyes are looking at you.

If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

Seven Robbers robbed a bank and hide the coins in a lonely place.
They decide to divide the money equally the next morning. Two greedy robbers decided to cheat the others and reach the place at night. They equally divided the coins between them, one coin left. So they called another robber and then they decided to divide equally among the three. Sadly again one coin left. The same thing happened to the 4th 5th and the 6th robber.
However, when the 7th robber reached in the morning, they can divide the coins equally.

How many coins were there in total?

How can you write nineteen in a manner that if we take out one, it becomes twenty?

Can you write down eight eights so that they add up to one thousand?

How many times can you subtract the number two from the number fifty?

Before Mount Everest was discovered, what was the highest mountain in the world?

What has many keys but can’t open a single lock?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see?