The number of seconds the given clock loses in a day is required.
The number of seconds lost by the clock in one day is 240 seconds.
Algebra
The clock loses 20 seconds every hour.
A day has 24 hours.
If 20 seconds is lost every hour then the 20 seconds has to be added 24 times or the 20 has to be multiplied by 24.
So,
[tex]20\times 24=480\ \text{s}[/tex]
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