If the average weight of four boys in 60 kg and the weight of the fourth boy is one-fourth of the sum of the rest three boys. Then what what be the weight of the fourth boy?

The average height of four boys was recorded as 170 cms. If the average of the heights of three boys out of the four was 172 cms. What was the height of the fourth boy ?

The ratio of number of girls to number of boys is 1:2. If the average weight of the boys is 30 kg and the average weight of both the boys and the girls be 25 kg, then the average weight of the girls is:

The average weight of 21 boys was recorded as 64 kg. If the weight of the teacher was added, the average increased by one kg. What was the teacher's weight?

The average weight of 21 boys was recorded as 64 kg. If the weight of the teacher was added, the average increased by one kg. What was the teacher's weight ?

The ratio of number of girls to number of boys is 1 : 2. If the average weight of the boys is 30 kg and the average weight of both the boys and girls be 25 kg, then the average weight of the girls is :

The average weight of a class of 15 boys and 10 girls is 38.4 kg . If the average weight of the boys is 40 kg, then what is the average weight of the girls ?

The average weight of girls is 15 and the average weight of boys is 30 and the average weight of the boys and the girls both is 25. If the number of boys are 12, then the number of girls is :

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 :