If 21x = 79x, what is the value of x?

I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?

I have branches, but no fruit, trunk or leaves. What am I?

Find the number of squares in the below-given picture.

Decode the below four famous ciphers:

8P of the SS
1M of the E
1S of the SS
60M in 1H

Chhote se Chintu Miyan,
Lambi si Pooch.
Jahan Jaye Chintu Miyan,
Wahan Jaye Pooch.

छोटे से चींटू मियाँ,
लंबी सी पूंछ।
जहाँ जाये चींटू मियाँ,
वहाँ जाये पूंछ।

Bolo kya?

What has many teeth, but cannot bite?

If a wheel has 54 spokes, how many spaces are there between the spokes?

A high school has a strange principal. On the first day, he has his students perform an odd opening day ceremony:

There are one thousand lockers and one thousand students in the school. The principal asks the first student to go to every locker and open it. Then he has the second student go to every second locker and close it. The third goes to every third locker and, if it is closed, he opens it, and if it is open, he closes it. The fourth student does this to every fourth locker, and so on. After the process is completed with the thousandth student, how many lockers are open?

On a bus, there is a 26-year-old pregnant lady.
A 30-year-old policeman.
A 52-year-old random woman.
And the 65-year-old driver.

Who is the youngest?