Fred is 4 times as old as Nathan and is also 27 years older than Nathan.
Let f be Fred's age and let n be Nathan's age.
Which system of equations represents this situation?
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a.n=4f
n=f+27
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b.f=4n
f=n−27
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c.4f=n
f=n+27

d.​f=4n
f=n+27
​
whic answer is it