It looks like a simple math sum but has left people scratching their heads... can you solve it?

It looks simple at first, but this math problem has the internet stumped. Don't be fooled - it demands more brainpower than ...
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5 Electrical Add-Ons You Shouldn't Install Yourself – NFPA Warns

The temptation to handle electrical projects yourself has grown stronger as home improvement costs continue to climb. Yet ...