Solution:

Alexandra used two planks as shown in the picture below.

Solution:

You are the ship captain. Read the first sentence again. Therefore, the color is same as your eyes color.

Solution:

295 minutes.

Explanation
When he cut 59 stocks, the 60th stock will remain.
59 * 5 = 295 minutes.

Solution:

Explanation:

Since Rohini is 21st from either side, there must be 20 people in front of her and 20 people behind her.
20 + 20 + 1 (she herself) = 41
Therefore, the queue consists of 41 people.

Solution:

No stairs, Its a one story building.

Solution:

You should choose the second shop.

It's a common logic. In the first shop, the barber had neat hairs. Since there are only two barbers in the entire town, he must have got his hairs cut from the barber in the second shop.

Solution:

The police officer knows the story was not true since Vasco was shot from back and he was injured only in the stomach.

Solution:

21

Solution:

The correct way to solve this question is go backwards. If the number of marble gets doubled every minute and after two hours, it is filled completely, one minute ago it would be half.

So, it will take 1 hour and 59 minutes for it to be filled half.

Solution:

Ted will choose Ann.

You can know why after replacing each letter with the number corresponding to that letter (A = 1, B = 2, C = 3... etc.)

TED = 20 + 5 + 4 = 29
ANN = 1 + 14 + 14 = 29

If you calculate in a similar manner for George and Mary, you will find that each one of them adds up to 57