Find the Next Number in the Sequence

2 9 3 1 8 4 3 6 5 7 ?

Solve the alphametic puzzle by replacing the alphabet with the number.

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That attorney is my brother, testified the accountant.

But the attorney testified he didn't have a brother.

Who is lying?

The centre of the third figure is empty. What digit should fit inside?

There is a place where if I stand up straight, I will still be considered sideways.

What number should come in place of the question mark below?

The person who makes it has no need for it; the person who buys it has no use for it. The person who uses it can neither see nor feel it. What is it?

Can you solve this picture maths equation?

What is the fastest way to double your money?

When a clock is observed, the hour hand is at a minute mark and the minutes hand is six minutes ahead of it.

When the clock is observed again after some time, the hour hand is precisely on a different minute mark and the minute hand is seven minutes ahead of it.

Can you calculate how much time has elapsed between the two observations?