ALGERA
posted by KIM .
Suppose AD=E, thAt N= 15,200, E/A= .40 and N/E=.25. compute D/A

as N/E = .25, N = .25 * E
> E = 60,800 as 15,200 = .25 * E
as E/A = .40, E = .40 * A
> A = 152,000 as 60,800 = .40 * A
as A  D = E,  D = E  A
as  D =  91,200, D = 91,200
> D/A = 91,200 / 152,000 = .60 
easier way:
AD=E , divide each term by A
A/A  D/A = E/A
1  D/A = .40
1  .40 = D/A
D/A = .60
N never entered the picture.
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