36 students took a final test in math.the average score of those who passed was 78, while the average score of those who failed was 60.the average of all the scores was 71. how many of the students passed?

Answer 1

number passed ---- x
number failed ------ 36-x

sum of scores of passers = 78x
sum of scores of failures = 60(36-x)

78x + 60(36-x) = 71(36)

solve for x

Answer 2

thanx