What does this rebus riddle means ?

Chef Andrea has to light the kitchen stoves to open her restaurant for the day. There are three stoves in the kitchen: A glass stove, a brick stove, and a wood stove. She only has one match. Which does she light up first?

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?

What does does this rebus picture means ?

What four weights can be used to balance from 1 to 30 pounds?

Living above a star, I do not burn
Eleven friends and they do not turn
I can just be visited in a sequence, not once or repeatedly
PQRS are my initials
Can you tell my name accurately?

Count The number of F's in the paragraph below:

"FINISHED FILES ARE THE RESULT OF YEARS OF SCIENTIFIC STUDY COMBINED WITH THE EXPERIENCE OF YEARS"

I can sizzle like bacon,
I am made with an egg,
I have plenty of backbone, but lack a good leg,
I peel layers like onions, but still remain whole,
I can be long, like a flagpole, yet fit in a hole.

John replied, when asked how old he was. In 2 years he will be twice as old as he was five years ago.' How old is he ?

Prove that the below maths equation is true.

8 + 8 = 91