How can you make the following equation true by drawing only one straight line: 5+5+5=550 ?

Complete the following series. It.s very logical:

1, 4, 5, 6, 7, 9, 11, __?

Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

Why do we preferably have round manhole covers and not square ones?

Why Aeroplane windows are round?

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?

How can you write nineteen in a manner that if we take out one, it becomes twenty?

A person was found dead on a big green land with no trees or buildings around. When the police arrived, they found a piece of rock lying next to him and the man was wearing clothes comprising of red, blue and yellow colours.

Can you tell who the person is and what was the cause of death?

A number can be multiplied by multiple of nine
i.e 9 18 27 36 45 ...

and the resulting number consist of only one digit.

Can you identify the number ?

I want to fill my bucket using both cold and hot water.
I have two taps for both cold and hot water. The hot water tap fills the bucket in exact 6 hours and the cold water tap fills the bucket in exact 4 hours.
I turn both of them simultaneously but I forgot to turn off another tap which removes the water out of the bucket. This tap can empty the bucket in 12 hours.

How Long will it take to fill the bucket?