John was working on a Chemical Mixture whose weight comprise 90% liquid and 10% solid. The total weight of the mixture is 20 pounds. After a while, John noticed that some of the liquid evaporated and now the liquid comprises just 50% of the weight.

What is the weight of the chemical mixture now?

There is a place where if I stand up straight, I will still be considered sideways.

Which three-digit number, made of consecutive digits, like 567, is 2 less than a cube and 2 more than a square?

Using four sevens (7) and a one (1) create the number 100. Except for the five numerals, you can use the usual mathematical operations (+, -, x, :), root and brackets ()

What part of the chicken has the most feathers?

Only one color, but not one size,
Stuck at the bottom, yet easily flies.
Present in sun, but not in rain,
Doing no harm, and feeling no pain.
What is it?

Solve the following series:
AZ, GT, MN, __, YB

The current time can be represented by below textual rebus.

0
=========
B.Sc
LLB

Can you tell us the current time?

You need to climb ten stairs. At every stair, you can either take one step up or you can jump two steps up.

In how many different ways you can climb 10 stairs?

What's a single-digit number with no value?