4n-11=9 replacement set of 4,5,6

Twenty-five percent of the customers entering a grocery store between 5 p. m. and 7 p. m. use an express checkout. consider five randomly selected customers, and let x denote the number among the five who use the express checkout.

Find x to the nearest hundredth place

45% of the trees in a park are apple trees. there are 27 apple trees in the park. how many trees are in the park in all?