Which Number is the odd one out?

A) 7145
B) 2716
C) 5321
D) 4135

A King wants to send the diamond ring to his girlfriend securely. He got multiple locks and their corresponding keys. His girlfriend does not have any keys to these locks and if he sends the key without a lock, the key can be copied in the way. How can King send the ring to his girlfriend securely?

What is the four-digit number in which the first digit is one-third the second, the third is the sum of the first two, and the last is three times the second?

Can you make numbers like 24, using numbers 3,3,7 & 7 with any arithmetic operator?

John enters a small room. The Door Closes.
When the door opens, John is in a larger room.

Explain?

The product of three consecutive numbers is 7980.
Then the sum of these consecutive numbers would be?

If you drop me I’m sure to crack, but give me a smile and I’ll always smile back. What am I?

2, 3, 5, 9, 17, _ What is the next number in the sequence?

Jack was having a candle light dinner with his girlfriend. Suddenly a cold gush of wind entered through the open window and three of the ten candles were extinguished. Assuming that none of the other candles were extinguished.

How many candles are they left with in the end ?

All of Jacob's shoes are red except two.
All of Jacob's shoes are green except two.
All of Jacob's shoes are yellow except two.

How many shoes does Jacob have?