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From: "Edward Rawde" <invalid@invalid.invalid>
Newsgroups: sci.electronics.design
Subject: Re: A Complex Metaphysical Conundrum
Date: Wed, 10 Apr 2024 16:11:39 -0400
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"john larkin" <jl@650pot.com> wrote in message 
news:v6sd1j1sr89ntc214dku5u5e04pks5toud@4ax.com...
> On Wed, 10 Apr 2024 15:57:55 -0400, "Edward Rawde"
> <invalid@invalid.invalid> wrote:
>
>>"Cursitor Doom" <cd@notformail.com> wrote in message
>>news:c6hd1jdjimga6ifo7b0kv7bqfj9750lbk3@4ax.com...
>>> Gentlemen,
>>>
>>> This is an exam question that trips up even some of the best students.
>>> See what you make of it!
>>>
>>> Q: Is this statement correct: 'The signal level at the modem input
>>> increased by 2dBmV going from +3dBmV to +5dBmV.'
>>>
>>> Your pal, CD.
>>
>>Changing a signal level can be thought of as multiplying the signal by a
>>constant.
>
> You can change something by adding, too.
>

I haven't looked at it in detail but a bit of playing with a search engine 
finds the question here:
https://broadbandlibrary.com/wise-and-mighty-decibel/