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.

The sum of a mother, her baby and her dog's weight is 170 Kg. How much does the baby weigh if the mother weighs 100 kg more than the combined weight of the baby and the dog, and the dog weighs 60 per cent less than the baby?

There are nine letters in the below-given diagram. You have to form a nine-letter word using these letters.

At my favorite fruit stand,
an orange costs 18,
a pineapple costs 27,
and a grape costs 15.
Using the same logic, can you tell how much a mango costs?

Can you identify the famous TV character from the rebus below?

What does the below rebus riddle means?

What four weights can be used to balance from 1 to 30 pounds?

Which is faster, Heat or Cold ? Explain.

Find the next number in the series.
1 10 24 43 67 ?

What is so fragile that saying its name breaks it?