I’m tall when I’m young, and I’m short when I’m old. What am I?

Baseball bat and ball cost $100. If the bat cost $99 more than the ball, what is the cost of each?

If,
9 * 8 * 7 = 65
8 * 7 * 6 = 50
7 * 6 * 5 = 37

Find
6 * 5 * 4 = ?

What number does the below three word/phrase identify and why?
1. Deck
2. Year
3. Singing in the Rain

Find The Next Number in this series.
1, 2, 6, 42, 1806 ?

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

Doctor Alex and a bus driver John are both in love with the same woman named Olivia. The bus driver need to go for a long trip of 10 days, Before he left he gave Olivia 10 apples.

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 man has to get a fox, a chicken, and a sack of corn across a river.

He has a rowboat, and it can only carry him and one other thing.
If the fox and the chicken are left together, the fox will eat the chicken.
If the chicken and the corn are left together, the chicken will eat the corn.

How does the man do it?

If 21x = 79x, what is the value of x?