A school has 8 periods a day each of 45 minutes duration. How long would each period be, if the school has 9 periods a day, assuming the nuber of school hours to be the same?

If half life period of a first order reaction is x and 3//4 th life period of the same reaction is y. How are x and y related to each other?

In a school,students thought of planting tress in and 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 studing e.g.a section of I class will plant 1 tree,a section of II class will plant 2 trees and so on,a section of XII class will plant 12 trees.There are three sections of each class. Find out how many trees were planted.

A farmer has enough food to feed 20 animals in his cattle for 6 days. How long would the food last if there were 10 more animals in his cattle?

There are six period every day in a school on 5 subjects are to be taught in a day.In how many ways can the subjects be taught in a days?

Show how you would connect three resistors, each of resistance 6Omega , so that combination has a resistance of 9Omega .

In a primary school parents asked about of the number of hours they spend per day in helping their children to do home work. There were 90 parents who helped for frac(1)(2) hour to 1frac(1)(2) hours. The distribution of parents according to the time for which, they said they helped is given in the adjoining figure, 20% helped for the than 1frac(1)(2) hours per day, 30% helped for frac(1)(2) hour to 1 hours, 50% did not help at all. Using this, answer the following : How many said that they helped more than 1frac(1)(2) hours?

In a primary school parents were asked about of the number of hours they spend per day in helping their children to do home work. There were 90 parents who helped for frac(1)(2) hour to 1frac(1)(2) hours. The distribution of parents according to the time for which, they said they helped is given in the adjoining figure, 20% helped for more than 1frac(1)(2) hours per day, 30% helped for frac(1)(2) hour to 1 hours, 50% did not help at all. Using this, answer the following : How many said that they didnot help?

lo, one of the satellite's of Jupiter, has an orbital period of 1.769 days and the radius of the orbit is 4.22 xx 10^8 m. Show that the mass of Jupiter is about one-thousandth that of the sun