There is no required or optimum number. Poorer households, especially in the third worls, have none. Boarding houses my have one for several inhabitants. Rich homes may have a dozen.
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Two flush valve style toilets(comm.) or three tank style toilets(res.).>
Litres per capita per day . LPCD captures the amount of water required for household use in terms of per head usage. This is useful in calculating demand for drinking water for a habitation.
-- take the number of parts per thousand-- multiply it by 1,000-- the answer is the number of parts per million
The number of cycles per second, or frequency, is expressed in hertz, abbreviated Hz.
the number of sales / number of covers