By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?

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

I am thinking of a five-digit number such that:
The first and last digits are the same, their submission is an even number and multiplication is an odd number and is equal to the fourth number. Subtract five from it and we obtain the second number. Then divide into exact halves and we get the 3rd number.

What number I am thinking of?

Imagine you are in a room with no windows or doors. How will you get out?

By moving just one matchstick, you need to make the below statement true. Can you do it?

Analyze and find the missing item in the sequence:
16, 06, 68, 88, __, 98

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 ?

Can you find the least possible number such that

If the number is divided by 3, it gives the remainder of 1;
If the number is divided by 4, it gives the remainder of 2;
If the number is divided by 5, it gives the remainder of 3;
If the number is divided by 6, it gives the remainder of 4.

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

Can you find out the missing number in the grid?