Which of these options should the students choose if the lowest score on the six quizzes was 10 points?

Question

Six columns represent the average score for a student on six 20-point quizzes. The average is 14, but to obtain a satisfactory grade, an average of 15 is needed. The teacher gives two options to raise the average: (1) Throw out the lowest quiz score and base the average on the five remaining quiz scores or (2) take a seventh 25-point quiz to raise the average. Which of these options should the students choose if the lowest score on the six quizzes was 10 points?

Answer 1

(14*6 - 10)/5 = 14.8
(14*6 + x)/7 ≥ 15
84 + x ≥ 105
x ≥ 21
...better take the 25-point quiz in hopes of scoring 21 or better.....