using four eights (8) and a one (1) and one mathematical symbol , create the number 100

I have a five and a three-gallon jar. Assuming there is an infinite supply of water, how can I measure one-gallon water?

Jessica is telling her friends this story and asks them to guess if it’s the truth or a lie: “There was a man sitting in a house at night that had no lights on at all. There was no lamp, no candle, and no other source of light. Yet, he sat in the house and read his book happily.” Her friends say she’s lying, but Jessica corrects them and says she’s telling the truth. Jessica’s story is true—but how?

A mile-long train is moving at sixty miles an hour when it reaches a mile-long tunnel. How long does it take the entire train to pass through the tunnel?

Can you find a five letter word that is left with only two letters if one is removed?

Find the next number in the following series:
6, 14, 26, 98, __?

Two boys were admitted to a school. When the headmaster asks them about their parents, they tell him that they have same parents (father and mother). On further inquiry, it turns out that they both share the same date for their birthday.

"Are you twins," ask the headmaster.
"No," replies the boys.

Is it possible?

What is the relationship between these matchstick pictures below?

Find the Odd One Out?
84129
32418
47632
36119
67626
72927

John leaves home and then he takes three right turns. John wants to return to home but he was scared of Jacob, who is wearing a mask.

What is John Situation ?