I am the black child of a white father, a wingless bird, flying even to the clouds of heaven. I give birth to tears of mourning in pupils that meet me, even though there is no cause for grief, and at once on my birth, I am dissolved into air. What am I?

You need to arrange three 7 and mathematical symbols to form number 1?

While preparing the table for dinner, wife came up with an idea to tease his mathematician husband. She asked her husband to pick nine toothpicks and make ten without breaking any toothpick.

The husband was also smart and did it within seconds. How ?

If,
29 - 1 = 30
9 - 1 = 10
14 - 1 = 15

Based on similar logic, Can you prove that the below algebraic equation is true?
11 - 1 = 10 ?

I am lying and I always lie. Tell me whether I am lying or telling the truth.

Can you find a five letter word that is left with only two letters if one is removed?

Find the Odd One Out?
84129
32418
47632
36119
67626
72927

A Shopkeeper sold a few chickens to four different customers on a particular day. It was such that each customer purchased half of the remaining chickens and half the chicken more.

Can you find out how many chicken were sold by the shopkeeper on that day if we tell you that the fourth customer bought a single chicken ?

Next Number in the Series,

5, 16, 49, 104, ?

Can you find the odd number in the following?

2716, 4135, 5321 and 7145