MEDIUM
Indian Army Agniveer
IMPORTANT
Earn 100

The average weight of boys in school is 60 kg while the average weight of girls is 55 kg. The average weight of both boys and girls is 58 kg. Find the number of girls in school if the number of boys is 720.

50% studentsanswered this correctly

Important Questions on Averages

EASY
Indian Army Agniveer
IMPORTANT
Achieve Indian Army Agniveer Mathematics Practice Book>Chapter 5 - Averages>Exercise 1>Q 2

In an Entrance Examination Ritu scored 56%  marks, Smita scored 92% marks and Rina scored 634  marks. The maximum marks of the examination are875. What are the average marks scored by all the three girls together?

EASY
Indian Army Agniveer
IMPORTANT
Achieve Indian Army Agniveer Mathematics Practice Book>Chapter 5 - Averages>Exercise 1>Q 3
The average weight of 19 men is 74 kgs and the average weight of 38 women is 63 kgs. What is the average weight (rounded off to the nearest integer) of all the men and the women together?
EASY
Indian Army Agniveer
IMPORTANT
Achieve Indian Army Agniveer Mathematics Practice Book>Chapter 5 - Averages>Exercise 1>Q 4
The average of 30 numbers is 40 and that of other 40 numbers is 30. The average of all the numbers is _____ .
EASY
Indian Army Agniveer
IMPORTANT
Achieve Indian Army Agniveer Mathematics Practice Book>Chapter 5 - Averages>Exercise 1>Q 5
In what proportion should buffalo milk costing₹40 per kg be mixed with cow's milk at₹30 per kg, so that there is a profit of 20% on selling the mixture at the rate of ₹ 40.8 per kg?
HARD
Indian Army Agniveer
IMPORTANT
Achieve Indian Army Agniveer Mathematics Practice Book>Chapter 5 - Averages>Exercise 1>Q 6
Jatin mixes water with whiskey and sells the mixture at the cost price of the whiskey, such that he makes a profit of 1623%. What will be the proportion in which Jatin adds water to the whiskey?
EASY
Indian Army Agniveer
IMPORTANT
Achieve Indian Army Agniveer Mathematics Practice Book>Chapter 5 - Averages>Exercise 1>Q 7
Ramu mixed 30ml of 40% acetic acid solution with 20ml of 60% acetic acid. In what ratio the resulting Solution mixed with 60% acetic acid to given 52% acetic acid again?
EASY
Indian Army Agniveer
IMPORTANT
Achieve Indian Army Agniveer Mathematics Practice Book>Chapter 5 - Averages>Exercise 1>Q 8
Two solutions of acid and water with ratio 2 : 7 and  4 : 5 are mixed in 2 : 1 ratio. What is the ratio of acid to water in the resulting mixture?
EASY
Indian Army Agniveer
IMPORTANT
Achieve Indian Army Agniveer Mathematics Practice Book>Chapter 5 - Averages>Exercise 1>Q 9
A container contains mixture of milk and water in which milk is 80%. 75% of mixture is taken out and 10 liters water is added, now the concentration of milk in the mixture is 60%. Find the quantity of water initially?