sandy wrote:

Jacob’s weekly take-home pay is n dollars. Each week he uses \(\frac{4n}{5}\) dollars for expenses and saves the rest. At those rates, how many weeks will it take Jacob to save $500, in terms of n ?

A \(\frac{500}{n}\)

B \(\frac{2,500}{n}\)

C \(\frac{n}{625}\)

D \(\frac{n}{2,500}\)

E \(625n\)

We can also use the

INPUT-OUTPUT approach.

Let's say n =

5 (Jacob takes $5 home each week)

This means Jacob SPENDS $4 each week.

So, he SAVES $1 each week

At this rate, how many weeks are needed to save $500?

It will take

500 weeks.

So, when we INPUT n =

5, the OUTPUT (the answer to the question) is

500Now check the answer choices to see which one yields an OUTPUT of

500 when we INPUT n =

5A) 500/

5 =

100 ELIMINATE

B) 2500/

5 =

500 KEEP

C)

5/625 =

less than 1 ELIMINATE

D)

5/2500 =

less than 1 ELIMINATE

E) 625(

5) =

over 3000 ELIMINATE

Answer: B

_________________

Brent Hanneson – Creator of greenlighttestprep.com

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