I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

When can we add 2 to 11 and get 1 as the correct answer?

Find The Missing Number In the Sequence.
6 25 64 ? 32 1

Find the value of "?" in the ball picture Riddle below:

What will you call your mother's brother's brother-in-law?

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

There is a box. The area of its top is 240 square units, the area of the front is 300 square units and the area of the end is 180 square units.

Can you calculate the dimensions of this box with the given data?

John left on a horse on Thursday , was gone for two days, and came back on Thursday after completing his work. How did that happen?

A man died, leaving $10,000,000 for his widow, 5 sons and 4 daughters. Each daughter received an equal amount, each son received twice as much as a daughter, and the widow received three times as much as a son.

How much did the widow receive?

A famous swimmer can swim downstream in a lake in exactly 40 minutes with the lake current.
He can swim upstream in that lake in exactly 60 minutes against the lake current.
The length of the lake is 2 km.

How long he can cover the distance of one side at a still lake with no current?