Can you solve the maths in the below-given picture equation?

Find out the missing number in the picture attached:

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

What will be the best approach to finding all the prime numbers less than 75 that leave an odd reminder when we divide them with 5?

A man stands on one side of a river, his dog on the other. The man calls his dog, who immediately crosses the river without getting wet and without using a bridge or a boat. How did the dog do it?

You see a mathematical expression in the picture. Can you think of a movie that this expression refers to?

Find the hidden tiger in the given optical illusion ?

I can be cracked, made, told, and played. What am I?

There were two grandmothers and their two granddaughters.
There were two husbands and their two wives.
There were two fathers and their two daughters.
There were two mothers and their two sons.
There were two maidens and their two mothers.
There were two sisters and their two brothers.
Yet there are only six, who are buried here,
All are born legitimate and relationships clear.
How can this happen?

When it is alive we sing, when it is dead we clap our hands. What is it?