When we see 2 but call 10?

Next Number in the Series,

5, 16, 49, 104, ?

On my way to St. Ives I saw a man with 7 wives. Each wife had 7 sacks. Each sack had 7 cats. Each cat had 7 kittens. Kittens, cats, sacks, wives. How many were going to St. Ives?

You are confined in a room and given two metal rods. Out of these two rods, one is magnet and the other is the iron rod. They look starkly similar. You don't have any other metal object in the room.

How will you decide which one of those is magnet?

When I get multiplied by any number, the sum of the figures in the product is always me. What am I?

Using mathematical symbols like +, -, and x in order to make the equations correct. Replace # with the above-given symbols.

9 # 8 # 7 # 6 # 5 # 4 = 91

What work can one never finish?

A man dies of old age on his 25 birthday. How is this possible?

I throw two dice simultaneously.

What is the probability of getting a sum as 9 of the two numbers shown?

You need to climb ten stairs. At every stair, you can either take one step up or you can jump two steps up.

In how many different ways you can climb 10 stairs?