Question

a tap drips at a rate of one drops/sec. 600 drops make 100ml the number of litres wasted in 300 days

Answer 1

ONE drop wasted per second
number of drops wasted for 1 day = 60*60*24=86400
number of drops for 300 days = 25920000
600 makes 100 ml 
so number of litres wasted in 300 days =25920000/600*10 =4320 litres