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A certain function takes an input value and transforms it into an output value according to the following three-step procedure: Step 1: Multiply the input value by 6.
Step 2: Add x to this result.
Step 3: Divide this result by 4.
If an input of 7 to this function yields an output of 15, what is the value of x?
  • a)
    12
  • b)
    16
  • c)
    18
  • d)
    24
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
A certain function takes an input value and transforms it into an outp...
Let the input number be 7.
Step 1: Multiply the input value by 6: 42
Step 2: Add x to that result: 42 + x
Step 3: Divide this result by 4: 
This must yield an output of 15: 
Multiply by 4: 60 = 42 + x
Subtract 42: 18 = x
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