T. S. Jain Solutions for Exercise 1: Exercise

A car covers the first $39 \mathrm{km}$ of its journey in $45$ minutes and covers the remaining $25 \mathrm{km}$ in $35$ minutes. What is the average speed of the car?

The average of five numbers is $56$. If the average of first four numbers is $54$, what is the value of the fifth number?

$A, B, C, D$ and $E$ are five consecutive odd numbers. Average of $A$ and $C$ is $59$. What is the smallest number?

The average of three consecutive even numbers is $5$ more than the average of three consecutive odd numbers. If the sum of the first of these three even numbers and the first of the three odd numbers is $31$, what is the second odd numbers?

The sum of five numbers is $260$. The average of the first two numbers is $30$ and the average of the last two numbers is $70$. What is the third number?

The average of five positive numbers is $308$. The average of first two numbers is $482.5$ and the average of last two numbers is $258.5$. What is the third number?

What is the average of the following numbers?

$42, 34, 56, 58, 60$

Find the approximate average of the following set of scores.

$1566, 2455, 1231, 2678, 1989, 3342, 2715$