What is the percent of 15 books to 21 books

If i have one apple and give you the apple, how many apples do i have?

According to a study conducted in 2015, 18% of shoppers said that they prefer to buy generic instead of name-brand products. suppose that in a recent sample of 1500 shoppers, 315 stated that they prefer to buy generic instead of name-brand products. at a 5% significance level, can you conclude that the proportion of all shoppers who currently prefer to buy generic instead of name-brand products is higher than .18? use both the p-value and the critical-value approaches.

Felix wrote several equations and determined that only one of the equations has no solution. which of these equations has no solution?