Total use in gallons per person per day = 42 gallons
Percentage going in flushing = 47%
Gallons going total per person per day in flushing total =
=(47/100)*42
=19.74 gallons
Gallons used per average flush = 4 gallons
Therefore average number of flushes per person per day =
= 19.74/4
= 4.935
= ~5 flushes
Thus this figure indicates an average of 5 flushes per day per person.
Hope this helps,
best of luck.