Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

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?

I look at you, you look at me I raise my right, you raise your left. What am I?

I’m orange, I wear a green hat and I sound like a parrot. What am I?

Four people need to cross a rickety bridge at night. Unfortunately, they have only one torch and the bridge is too dangerous to cross without one. The bridge is only strong enough to support two people at a time. Not all people take the same time to cross the bridge. Times for each person: 1 min, 2 mins, 7 mins and 10 mins. What is the shortest time needed for all four of them to cross the bridge?

Replace the question mark in the picture below.

Can you find the missing number in the third row?
35 20 14
27 12 18
5 2 ?

What English word has three consecutive double letters?

Six glasses are in a row. The first three are filled with milk and the last three are empty. By moving only one glass, can you arrange them so that the full and the empty glasses alternate?

What is 3/7 chicken, 2/3 cat and 2/4 goat?