Problema Solution
SA Van Alstine is required to publish an average of 3 intelligence information reports per week for 4 weeks. How many intelligence information reports does she need to publish in the fifth week to raise her average to 4 intelligence information reports published per week?
Answer provided by our tutors
let 'S' be the total of all reports published in the first 4 weeks
since the average per week for 4 weeks is 3 we can write
S/4 = 3
S = 12
let 'x' be the number of reports she needs to publish in the fifth week to make her average 4 that is
(S + x)/5 = 4
12 + x = 20
x = 8 reports
SA Van Alstine needs to publish 8 reports in the fifth week.