A school has 8 periods a day each of 45 minutes duration. How long would each perlod become, if the school has 6 periods a day? (assuming the num ber of school hours to be the same).

A man has 3 sons and 6 schools within his reach . In how many ways he can send his sons to school , if no two of his sons are to read in the same school ?

24 workers working 6 hours a day can finish a piece of work in 14 days.if each worker works 7 hours a day, find the number of workers to finish the same piece of work in 8 days.

A man has 4 sons and there are 5 schools within his reach. In how many ways can he admit his sons in the schools so that no two of them will be in the same school.

IF there are 6 periods in each working day of a school , then the number of ways that you can arrange 5 subjects the working day is

In a school, students thought of planting trees in an around the school to reduce air pollution. It was decided that the number of trees, that each section of each class will plant, will be the same as the class. In which they are studying e.g., a section of Class I will plant 1 tree, a section of Class II will plant 2 trees and so on till Class XII. There are three sections of each class. How many trees will be planted by the students?