Solution:

Beauty

Beauty is in the eye of the beholder (bee holder)

Solution:

What must be kept in mind before you start calculating through any method is that the weights can be put on both the pans.

So the weights - 1, 3, 7, 12, 43, 76, 102

The oldest man that can be weighed using these weights is a man aged 122 years

Solution:

Move and then pour all juice from second glass to fifth glass.

Solution:

Playing chess

Game needs two players so Brother-8 is playing chess with Brother-2

Solution:

40 balls

Solution:

Kid1, he was left with one rock.

Solution:

If you see the picture, they formed a pentagonal shape and achieved the required.

Solution:

The probability of two numbers being relatively prime is 60%. Thus if you keep playing the bet, you will hypothetically make 20 cents on every play.

Thus, you should accept the bet.

Solution:

7

Explanation:
8th is bald man head, check the video below.

Solution:

2 degree below zero

Solution:

Costa

Explanation:
c + 1 characters-> d
o + 2 characters-> q
s + 3 characters-> v
t + 4 characters-> x
a + 5 characters-> f

=> dqvxf = costa