Answer:
s=80
Step-by-step explanation:
5/8ths is .625
80 x .625 =50
Step-by-step explanation:
Assume that

hence,

now,

attached below is the complete solution
First case:
average of test score =70
number of students =p
total score of 'p' students = ( average of test score)*( number of students)
total score of 'p' students =70p
Second case:
average of test score =92
number of students =n
total score of 'n' students = ( average of test score)*( number of students)
total score of 'n' students =92n
total number of students = p+n
total average score =86
so, total score =86(p+n)
total score = total score of 'p' students +total score of 'n' students

now, we can simplify it



now, we can find p/n

................Answer
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Answer:
D. 5,322
Step-by-step explanation: 5280 feet in 1 mile, 42 feet in 14 yards