NCERT Solutions for Chapter: Algebra, Exercise 1: Exercise

Sarah buys books from a dealer for her bookstall.

She buys $20$ comic books, $15$ storybooks and $10$ colouring books. A comic book costs $₹ a$. A storybook costs $₹ 5$ more than a comic book and a colouring book costs $₹ 10$ more than a storybook.

Which of the following expression shows the total cost of the comic books?

Which of the following equations shows the commutative property of addition?

Sudhir observed the pattern shown below on a cloth. The pattern consists of $4$ patches.

The pattern is repeated n number of times in a $4$ meter long cloth.

Which of the following expressions shows the number of octagon patches on the cloth?

Sudhir observed the pattern shown below on a cloth. The pattern consists of $4$ patches.

The pattern is repeated n number of times in a $4$ meter long cloth.

Write an expression to represent an expressions which shows the total number of patches on the cloth?

Sudhir observed the pattern shown below on a cloth. The pattern consists of $4$ patches.

The pattern is repeated n number of times in a $4$ meter long cloth.

The cloth is cut into two equal halves. Sudhir observed both cloth parts have an equal number of repeating blocks but the last line is not complete. Which of the following expression shows the number of complete repeating blocks?

The symbolic form of " area $\left(\mathrm{A}\right)$ of a trapezium is half of the product of distance between the parallel sides $\left(\mathrm{h}\right)$ and sum of the lengths of parallel sides $\left(\mathrm{a}, \mathrm{b}\right)$ " is _____.

Write the following statement in symbolic form: The sum of a number and three fifth of the number is equal to $24$.

Write the following statement in symbolic form: A number is doubled and added to $6$, the result is equal to $14$.