What is the probability of guessing the correct answer to a true false question

What is the perimeter a square whose is 6.5 inches?

Suppoose you pay $3 to roll a fair die with the understanding that you will get back $9.00 if you roll a 1 or a 6 but nothing otherwise. What are your expecfted winnings?

George is 8 years older than Christopher and Ford is 2 years younger than Christopher. The sum of their ages is 60. Find the ages of George, Christopher, and Ford

As 900 hundreds is 9 thousands

A total of 517 tickets were sold for the school play. They were either adult tickets or student tickets. There were 67 more student tickets sold than adult tickets. How many adult tickets were sold?

You paid $28 in tax when you bought a $350 bike. What was the percent tax?

30% off coupon of a $750 t-shirt

How many times does 15 go onto 11

Which expression represents the fourth term in the binomial expansion of (e+2f) 10

A card is drawn from a standard deck of 52 playing cards. find the probability that the card is an ace or a black card.