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

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You can see three almost identical images below. Can you spot the odd one out from them?

Which Number is the odd one out?

A) 7145
B) 2716
C) 5321
D) 4135

Eight of us go fourth, not back, to protect our king from an attack. What are we?

Find a 9-digit number, which you will gradually round off starting with units, then tenth, hundred etc., until you get to the last numeral, which you do not round off. The rounding alternates (up, down, up ...). After rounding off 8 times, the final number is 500000000. The original number is commensurable by 6 and 7, all the numbers from 1 to 9 are used, and after rounding four times the sum of the not-rounded numerals equals 24.

You are a cab driver who pools passengers. You pick 3 people from a destination and drop 1 after an hour. 2 people climb aboard at the same time and you drop 3 at the next destination. After some time, you pick 2 passengers only to drop 1 after a short distance where 3 more passengers climb up the cab. You leave the rest of the passengers one by one to their destination and then come back home.

Can you tell the eye color of the cab driver?

How many cubic feet of dirt are in a hole of one foot deep, three feet long, and two feet wide?

What is both possible and impossible at the same time?

It is always ahead of me yet I can never see it. What is it?

You want to boil a two-minute egg. If you only have a three-minute timer (hourglass), a four-minute timer and a five-minute timer, how can you boil the egg for only two minutes?