Three brothers Jacob, John, and James live in Mexico City. The product of the ages of these brothers is 175. Jacob and John are twins. How old is James?

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 are given four results as below:
1111 = F
2222 = E
3333 = T
Then, can you find out how to code 4444?

Find the next number in the series?
2, 12, 36, 80, 150, 252, 392, _ ?

Can you find the odd number in the following?

2716, 4135, 5321 and 7145

If six children and two dogs were under an umbrella, how come none of them got wet?

What's the only room from which no one can enter or leave

what does this picture(rebus) riddle means ?

I have holes on the top and bottom. I have holes on my left and on my right. And I have holes in the middle, yet I still hold water. What am I?

Can you convert the number zero(0) into a positive number using just one mathematical operator ?