Question

 In the recent past, events such as 'Earth Day' attempts to increase consciousness of issues dealing with energy consumption. During such events, cities are often asked to switch off all appliances and lights for 1 day.
Calculate the
Amount of coal (kg) which would not be burned if the city did not use light bulbs for 1 day.
Assumptions 
Population of Hyderabad is approximately 120 lakh people.
3 members per house.
20% of houses in Hyderabad do not have electricity
Houses that do have electricity light 4 bulbs of 100 W for 6 hours a day.
(given that coal of 1 kg can give
$30 \times {10}^{6}$
​

Answer 1

Step-by-step explanation:

Earth Hour is a worldwide movement organized by the World Wide Fund for Nature (WWF). The event is held annually encouraging individuals, communities, and businesses to turn off non-essential electric lights, for one hour, from 8:30 to 9:30 p.m. on a specific day towards the end of March, as a symbol of commitment to the planet.[1] It was started as a lights-off event in Sydney, Australia, in 2007. Since then, it has grown to engage more than 7,000 cities and towns across 187 countries and territories to raise awareness for energy consumption and effects on the environment.[2]