When can we add 2 to 11 and get 1 as the correct answer?

What question can you never answer yes to?

I have one of the three numbers: 1, 2, or 3 in my mind. I speak only truth. You can ask me just one question for which I will only reply in yes or no or don't know. What question will you ask from me so that you are able to know the number?

My grandson is about as many days as my son in weeks, and my grandson is as many months as I am in years. My grandson, my son and I together are 120 years. Can you tell me my age in years ?

If,
9 * 8 * 7 = 65
8 * 7 * 6 = 50
7 * 6 * 5 = 37

Find
6 * 5 * 4 = ?

Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

What work can one never finish?

What does below Rebus mean ?

esgg sgeg gegs gsge

A maths symbol is hidden in the below Bar Graph. Can you decipher it?

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