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:

3.4142788e+29

The biggest number using four 2s will be:
22^22

Solution:

A Tongue

Solution:

295 minutes.

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

Solution:

Man: Superman, Rock: kryptonite

Solution:

5 plates.

Explanation
Let's say A is the number of plates washed successfully and B is a number of plates got broken in the cleaning process.
3A – 9B = 240
A + B = 100
=> B=5 (answer) , A(95)

Solution:

Bear

Explanation:
Bone - one + ear
= B + Ear
=> Bear

Solution:

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

Solution:

34293

Solution:

Alexandra used two planks as shown in the picture below.