What does this rebus riddle means ?

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

What word begins and ends with an E, but has only one letter?

There was a man he lives in a hotel each morning he presses the first floor button each evening if there is a person in the elevator he asks him to press the 10 floor button if there is no one in the elevator he takes the stairs why.

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?

My cousin lives in one story house in Antarctica. His house is made the of-of sandstone. what is the color of stairs?

Something Extraordinary happened on May 6th 19778 at 12:34am what was that?

Yesterday I fell from 30 feet high ladder but I don't get hurt. Why?

Five lovely ladies(Sophia, Isabella, Madison, Emma and Olivia) planned a picnic.

They each buy one thing each for the picnic.

Sophia, Emma and Olivia got a drink : orange-Juice, apple-juice, and mango-juice.
Olivia got the drink with the same letter as the one in her first name.
Emma loves mango-juice.
The other two bring some food : chocolates and pizza.
Also Madison is allergic to cheese.

So which ladies bought what ?

John left on a horse on Thursday , was gone for two days, and came back on Thursday after completing his work. How did that happen?