Question

Assume that S/A = 7.0, D/A = .40, N/E = .80 and A = D + E. Solve for N/S.

I'm lost. Does anyone have any tips? Thank you.

Answer 1

here's what i have so far but i think it's wrong:

s/d+e = 7.0
s=7d +7e

n/e = .80
n= .80e

.80e/(7d + 7e)

if that's even correct, i do not know. but if it is, then i get confused because i know d + e = a, but i don't know what to do with the 7s in front of d and e. basically i am lost. can anyone help? thank you.