There are 20 students with an average height of 150 cm. in a class. Then 10 students with an average of 120 cm. join. What will be average height of the class now?
Reveal answer
Fill a bubble to check yourself
Keep practicing — related questions
- A Leyden jar has a radius of 20 cm the height of the tin foils is 10 cm and thickness of glass is 3 cm. If ...
- The average marks of 22 students in section A of class 9 are 52, that of 23 students of section B are 50 an...
- A new study of school student has found that the average weight of those students, who take up cooking clas...
- The average age of 41 students of a class is 15 years. When one boy leaves the class, the average is reduce...
- Miss Gayatri's class has 12 girls and 20 boys. She wants to divide the students into groups so that, every ...
- Three years ago the height of Suraj was 206 cm. This year hir height is 240 cm. What is the increase in his...
- The average age of a family of 9 members is 26 years. If the youngest member of the family is 10 years old,...
- A ship anchored in a port has a ladder which hangs over the side. The length of the ladder is 200 cm, the d...