Kevin sells boxes of cookies for$4 each. Laura sells boxes of cookies for $6each. each of them sold the same dollar amount. It was smallest dollar amount for which this is possible 1] what was the amount of each of them sold. 2] How many boxes did Kevin sell 3] How many boxes did Laura sell. please help me!!!

In a test for esp (extrasensory perception), a subject is told that cards only the experimenter can see contain either a star, a circle, a wave, or a square. as the experimenter looks at each of 20 cards in turn, the subject names the shape on the card. a subject who is just guessing has probability 0.25 of guessing correctly on each card. a. the count of correct guesses in 20 cards has a binomial distribution. what are n and p? b. what is the mean number of correct guesses in 20 cards for subjects who are just guessing? c. what is the probability of exactly 5 correct guesses in 20 cards if a subject is just guessing?