Which tank will fill first?

Complete the following series. It.s very logical:

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

Can you find the odd one out from the below words ?

First Second Third Forth Fifth Sixth Seventh, Eighth Nine Ten Eleven Twelve.

Solve The below Equation:

ALFA + BETA + GAMA = DELTA

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?

Count The number of F's in the paragraph below:

"FINISHED FILES ARE THE RESULT OF YEARS OF SCIENTIFIC STUDY COMBINED WITH THE EXPERIENCE OF YEARS"

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 ?

Be active and find the killer in the picture Riddle below.

I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?

In the image given, you can find several triangles. Can you count them all?