sum of the digit of a two-digit number is 11. the given number is less than the number obtained by interchanging digits by 9. fine the number,
16th September is celebrated as World Ozone Day. To commemorate the day and to contribute to the environment you have planned to start a green club in your school. Write an application to the principal of your school seeking his permission to start the club. Inform him about the benefits...
What were 'English factories' and how were they different from modern factories?