R. S. Aggarwal Solutions for Chapter: Average, Exercise 1: EXERCISE 6A

The average temperature of Monday, Tuesday, Wednesday and Thursday wa $38°\mathrm{C}$ and that of Tuesday, Wednesday, Thursday and Friday was $40°\mathrm{C}$. If th temperature on Monday was $30°\mathrm{C}$, what was the temperature on Friday?

There were $35$ students in a hostel. If the number of students increases by $7$ , the expenses of the mess were increased by $\mathrm{Rs}.210$ per day, while the average expenditure per head was diminished by $\mathrm{Rs}.5 .$ . The original expenditure of the mess was:

The average consumption of petrol for a car for $7$ months is $110$ litres per month and for the next $5$ months, it is $86$ litres per month. The average monthly consumption of petrol is :

With an average speed of $40 \mathrm{km}/\mathrm{hr}$, a train reaches its destination in time. If it goes with an average speed of $35 \mathrm{km}/\mathrm{hr}$, it is late by $45$ minutes. The length of total journey is

The average score of a class of boys and girls in an examination is A. The ratio of boys and girls in the class is $3: 1$. If the average score of the boys is $(\mathrm{A}+1)$, then the average score of the girls is :

The average age of $6$ sons of a man is $8$ years. The average age of the sons together with their parents is $22$ years. If the father is older than the mother by $8$ years, then the age of the mother is :

The mean score of a group of students in a test was $56$ . The brightest $25\%$ of them secured a mean score of $80$ and the dullest $35\%$ a mean score of $32$ . The mean score of the remaining $40\%$ is

The average daily income of A, B and C is $\mathrm{Rs}.250$. If B earns $\mathrm{Rs}.50$ more than C and A earns double of what C earns, then the daily income of C is