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.

John was working on a Chemical Mixture whose weight comprise 90% liquid and 10% solid. The total weight of the mixture is 20 pounds. After a while, John noticed that some of the liquid evaporated and now the liquid comprises just 50% of the weight.

What is the weight of the chemical mixture now?

A bomb exploded in a room full of married couples and no one died. How?

Can you find out the number that should replace the question mark with a valid reason?

what's the probability of getting a king or a queen from a pack of 52 cards?

What is the probability of getting five Mondays in a 31-day month?

10 people came into a hotel with 9 rooms and each guest wanted his own room. The bellboy solved this problem.
He asked the tenth guest to wait for a little with the first guest in room number 1. So in the first room, there were two people. The bellboy took the third guest to room number 2, the fourth to number 3, ..., and the ninth guest to room number 8. Then he returned to room number 1 and took the tenth guest to room number 9, still vacant.
How can everybody have his own room?

Take 9 from 6, 10 from 9, 50 from 40, and leave 6.

How Come ??

In a certain country ½ of 5 = 3. If the same proportion holds, what is the value of 1/3 of 10?

What demands an answer, but asks no questions