Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

It has horns but can’t beep. It is like to bleat but It is not a sheep. What is it?

How can you take 2 from 5 and leave 4?

Speaking of rivers, a man calls his dog from the opposite side of the river. The dog crosses the river without getting wet, and without using a bridge or boat. How?

I am green and found in the forest and have needles instead of leaves. What am I?
Hint 1: It can be used for Christmas decorations.
Hint 2: I have a strong, scent that is used in air fresheners.

Can you place six X (crosses) in below board without making three in a row in any way ?

Three people check into a hotel. They pay $60 for the rent of the room. After they check-in, the manager realize that the rent for the room is $55. So, he gives $5 to the bellboy and asks him to give it to them. The bellboy thinks that it will be difficult for the three people to share $5 among them and seeking the personal benefit, he pockets $2 and gives the remaining $3 to them.

Now, each person paid $20 and got back $1. In this manner, each of them paid just $19 which totals to the amount of $57. The bellboy has $2 with him and adding them, we get $59. So where is the remaining $1?

Can you name some countries which do not have the alphabet 'A' in them?

How many pluses should we put between the digits of 987654321 to get a total of 99, and where?

What is the four-digit number in which the first digit is one-third the second, the third is the sum of the first two, and the last is three times the second?