What has no start, end, or centre?

If a boy blows 18 bubbles,
Then pops 6 eats 7 and then
He pops 5 and blows 1.
How many are left?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

I know a ten-letter word in the English language which can be typed using only the top rows of the computer keyboard.

What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

I have a mouth but I don't eat.
I have a bank but have no money.
I have a bed but i dont sleep.
I wave but have no hands.

Who Am I ?

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

Move four matchsticks to the below square to form three squares?

There is a shop where written:
Buy 1 for $1
10 for $2
100 for $3
I needed 999 and still only paid $3. How could this be financially viable for the shop-keeper?

There is a hypothetical state between the USA and Mexico border 'Tango'.
Here 70 percent of the population have defective eyesight, 75 percent are hard of hearing, 80 percent have Nose trouble and 85 percent suffer from allergies, what percentage (at a minimum) suffer from all four ailments?