If eleven plus two equals one, what does nine plus five equal?

What can run but never walks, has a mouth but never talks, has a head but never weeps, has a bed but never sleeps?

Sally lives in a place where six months of the year is mild summer and the temperature drops significantly the other six months. She owns a lake where there is a small island. She wants to build a house on the island and needs to get materials there. She doesn’t have a boat, plane, or anything to transport them to the island. How does Sally solve this problem?

Two fathers and two sons decided to go to a shop and buy some sweets upon reaching. Each of them bought 1 kg of sweet. All of them returned home after some time and found out that they had 3kg of sweets with them.

They did not eat the sweets in the way, nor threw or lose anything. Then, how can this be possible?

Can you find out the remainder when 3^300 is divided by 5?

What is greater than gold but cannot be bought. it can never be sold and can earn if its sought. though it can be broken, it can still be fixed. for by birth it can't start nor by death it is ended.what am i?

What is a word made up of 4 letters, yet is also made up of 3. Sometimes is written with 9 letters, and then with 4. Rarely consists of 6, and never is written with 5.

Prove that the below maths equation is true.

8 + 8 = 91

Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

How can you make the following equation true by drawing only one straight line: 5+5+5=550 ?