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Answer:
Replacing computer parts.
Explanation:
John replaces faulty computer parts, such as DVDs, hard drives, ram cards, wires etc. John can also replace the whole motherboard or clean it (for dust).
Computer parts not functioning properly or dying is a common problem in computer systems. Motherboard, the circuit that holds all the components of a computer, like CPU, Ram and Hard disk, can also fail or die.
Because the measurement is relative to the unit. For example:
A measurement is six. But could be 6 inches, 6 yards, 6 nm, 6 feet, six as a quantity, six packages, six items, etc.
So until you specify the unit, that number means nothing.