How can you make number one disappear by adding something to it?

What do you see in the given picture?

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

Can you find out the missing number?

? 4 5 3 5

9 5 7 10 3

Can you find out the missing number in the grid?

Which statement is true out of the following?
One statement here is false.
Two statements here are false.
Three statements here are false.

Jim and Sarah are in a long-distance relationship. Jim buys an engagement ring for Sarah and wants to mail it to her. Unfortunately, the only way to ensure the ring will be received is to place a lock on the package. Jim has locks and Sarah has locks, but neither has keys for each other’s locks. How can they make sure the ring isn’t stolen?

Two friends were betting. One said to the other, "The coin will be flipped twenty times and each time the coin lands on the head, I will give you $2 and each time it lands on the tale, you will give me $3." After flipping the coin twenty times not a single penny was exchanged among them.

How many times did the coin land on heads?

Can you count the number of triangles in the given picture?

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?