Answer:
Step-by-step explanation:
Two brothers get three pounds to share is the answee.
If f(x)=69-15x then 
Given :

Lets find out
. The steps to find out f inverse are
Replace f(x) by y

Now we find 
Replace inverse function in the place of x in f(x)

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The answer is 345 because you are suppose to multiply then add them togther