R. Gupta Solutions for Chapter: Average, Exercise 1: EXERCISE

Out of four numbers, the average of first three is $15$ and that of last three is $16$. If the last number is $19$, the first is:

The average age of an adult class is $40$ years. $12$ new students with an average age of $32$ years join the class, thereby decreasing the average by $4$ years. The original strength of class was:

The average age of $24$ students in a class is $10$ years. If the teacher's age is included, the average increases by $1$ year. The age of the teacher is:

The average age of A, B, C and D five years ago was $45$ years. By including X, the present age of all the five is $49$ years. The present age of X is:

The average expenditure of a man for the first five months is Rs $120$ and for the next seven months it is Rs $130$. If he saves Rs $290$ in that year, his monthly average income is:

The average weight of a class of $40$ students is $40$ kg. If the weight of the teacher is included, the average weight increases by $500$ grams. The weight of the teacher is:

The average weight of $8$ persons is increased by $2.5$ kg, when one of them, whose weight is $56$ kg, is replaced by a new man. The weight of new man is:

If $a, b, c, d, e$ are five consecutive odd numbers, their average is: