Two boys weigh 25 kg and 20 kg. Find the ratio of their weights.

In a class there are 35 girls and 20 boys and the total average weight of class is 38 Kg. Total average weight of boys is 52 kg. Find the approximate average weight of girls ?

Two moving bodies of masses 5 kg and 25 kg have same kinectic energies . Find the ratio of their linear momentum .

Two children weighing 15 kg, wt and 25 kgwt. sit at the ends of a see-saw, pivoted at its centre. The see-saw is 4 m long. Where should a third child, weighing 20 kg wt. sit, in order to balance the see-saw? (Neglect the weight of the see-saw)

In a class of 30 students, the average weight of boys is 20 kg and the average weight of the girls is 25 kg. The fraction of boys out of the total students of the class is :

In a class of 30 students, the average weight of boys is 20kg and the average weight of the girls is 25kg. The fraction of boys out of the total students of the class is :

In a class, there are 20 girls and 30 boys . The mean weight of 20 girls is 35 kg and mean weight of 30 boys is 60 kg. Find the mean weight of the class

In a class, there are 30 boys and 20 girls. The average weight of 30 boys is 60 kg and average weight of 20 girls is 35 kg. Find the average weight of the class.

If the average weight of the students of a class is 15kg, the average weight of the students of another class is 30kg and average weight of the students of both the classes is 25kg, then find the ratio of the number of students of the first class to the another class.