Why is the Hole below a Lock?

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

A cat, a dog and a monkey were stolen. 3 suspects got caught: Harish, Manoj and Tarun. All we know is each person stole one animal, but we do not know who stole which. Here are the investigation statements. Harish said: Tarun stole the cat. Manoj said: Tarun stole the dog. Tarun said: They both were lying. I did not steal the cat or the dog. Later on, the police found out the man who stole the monkey told a lie. The man who stole the cat told the truth. Can you find out who stole which?

If,

20 % 5 = 24

21 % 7 = 33

42 % 6 = 67

Then;

66 % 6 = ?

Which is faster, Heat or Cold ? Explain.

Complete the series by replacing "?" with the correct number.

ST ND RD TH '?'

I am a white box having no key or lid.
Yet there is a golden treasure inside it.

What Am I?

In the addition below, all digits have been replaced by letters. Equal letters represent equal digits and different letters represent different digits.
ABCABA
BBDCAA
ABEABB
ABDBAA
------- +
AAFGBDH
What does the complete addition look like in digits?

How many triangles are there in the picture below?

Which three-digit number, made of consecutive digits, like 567, is 2 less than a cube and 2 more than a square?