Question

a student scores 65 and 82 out of 100 in the two test different test. How much does the student need to score in the next test which also has a max score of 100, in order that the average of the three test is a least 75?

Answer 1

Since the average should be at least 75, the inequality sign to be used is

Answer 2

greater or equal to sign

Answer 3

How do you get an average?
You add all the scores, divide it by 3
One of the scores will be x

Answer 4

(65 + 82 + x )/3 >= 75
multiply the equation by 3
65 + 82 + x >= 225
147 + x >= 225
x >= 225 - 147
x >= 78

the student has to make at least 78

Answer 5

(65+82+x)/3≥75
miltiply both side by 3
65+82+x≥225
147+x≥225
x=225-147
x=78