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

Which Number is the odd one out?

A) 7145
B) 2716
C) 5321
D) 4135

Can you Find and name the hidden bird in the picture below ?

Find the next number in the sequence

1, 2, 6, 21, 88, __?

In a science lab, a petri dish hosts a healthy colony of yeast for an experiment. Now every minute, all the yeast cells divide into two. At noon, there was just a single cell of yeast and at 1:22, the Petri dish was half full. Can you calculate when the dish will be full of yeast?

John went to a parrot shop in Mexico, and the parrot owner told him that his parrot is so unique that he repeats everything he hears. John got excited and immediately bought the parrot. John went home and spoke many words, but the parrot does not repeat anything.
He went again to the parrot shop and complaint to the shopkeeper, but the shopkeeper never lied. Explain?

A man is sitting in a bar when a rich man sits next to him. He turns to the rich man and says, “Did you know I know almost every song that has ever existed?”

The rich man laughs. The man then says, “I bet you all the money you have in your wallet that I can sing a genuine song with a lady’s name of your choice in it. The rich man laughs again and says, “OK, how about my daughter’s name, Jamie Armstrong-Miller?” Minutes later, the man collects his cash and the rich man goes home cashless. What song did the man sing?

I live in a bowl. I can swim. I have a tail. I also have fins and big eyes. What am I?

What is the word or phrase?

Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?