Math Riddles

Answer: 90 percent. If you pick the heads coin the chance of getting the first 2 heads is 100 percent (4/4) and if you pick the fair coin the chance is 25 percent (1/4). So from this, the chance that it is the heads coin is 4/5 and the fair coin 1/5.

Then, if it is the heads coin you will definitely get heads (4/5). If you flip the fair coin it is 1/10 (1/5 * 1/2). Add the probabilities together: 4/5 + 1/10 = 9/10.

Answer: Rock Paper Scissors

Answer: 1. is 0. 2. is 89498784893246798648732742974823.

Answer: The jar full of quarters would have the highest value because a quarter is worth more than a dime and penny. Amount refers to quantity, so if they have equal amounts there will be an equal number of each.

Answer: One series is 8, 9, 11, 14 (add 1, 2, 3) and the second series is 43, 38, 34, ? (subtract 5, 4 - next number to substract is 3). Correct answer is 31