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.