In one hour eyes blink 900 times. Assuming constant rate of eye blink each hour eye will blink 8 times than one hour in 8 hours.
Eye blink in one hour `= 900`
Eye blink in eight hours `= 900xx8 = 7200`
So the eye will blink 7200 times approximately within 8 hours.
It is given that eyes blink 900 times each hour. To determine how many times you would blink your eyes in 8 hours multiply the number of times eyes blink in an hour by the number of hours.
Multiplying 800 by 9 gives 800*9 = 7200.
In 8 hours you would blink your eyes 7200 times.
Since a eye blinks 900 times a hour, to find out how many times in 8, you simply multiply by 8.
900*8= 72,000 times a eye blinks in 8 hours