All of Jacob's shoes are red except two.
All of Jacob's shoes are green except two.
All of Jacob's shoes are yellow except two.

How many shoes does Jacob have?

Below, you will find the mathematical proof that 10 equals 9.99999?. But is that possible or there is something wrong about it? Can you find the error?

x = 9.999999...
10x = 99.999999...
10x - x = 90
9x = 90
x = 10

My thunder comes before the lightning; my lightning comes before clouds; my rain dries all the land it touches. What am I?

Where do you go to learn how to make ice cream?

I am white when I am dirty, and black when I am clean. What am I?

Keyboard words are not in alphabetical order, Why?

Can you think of any three-dimensional shape that comprises of exactly two surfaces?

What goes up but never comes down?

I hide my treasure in the ground, my tail is big and fluffy. If you spot me in a tree, please don’t call me scruffy. What am I?

If,

A + B = C
D - C = A
E - B = C

Based on the above equations, find out the answer for:

D + F = ?