Question

The residential colony has a population of 5400 requires 60 litres of water is per person per day. For the effective utilization of rain water, a group of people decided for WATER HARVESTING. They constructed a water reservoir measuring 49m * 27m * 25m to collect the rain water. If this water reservoir is full of water then for how many days will it last for the colony.

Answer 1

ANS : ⇒WATER REQUIRED FOR 5400 PERSONS PER DAY = 5400 × 60
                                                                                                 = 324000 litres
                ⇒VOLUME OF WATER IN RESERVOIR = 49 × 27 × 25
                                                                               = 33075 m³
                                                                         =33075000 litres (∵ 1m³=1000 L) 
⇒NO. OF DAYS WATER WILL LAST =
 WATER REQUIRED FOR 5400 PERSONS PER DAY/VOLUME OF WATER IN RESERVOIR
= 324000/3307500
=102.083 days = 102 days (approx.)