Mathematical Operations on Expressions

Q. Which of the following operation is not allowed in an equation?

1. Adding the same number to both sides of the equation
2. Subtracting the same number from both sides of the equation
3. Multiplying both sides of the equation by the same non-zero number
4. Dividing both sides of the equation by zero

Q. $3x+15=10$ is a simple equation. If $5$ is added to the left-hand side of the equation, the equation remains the same as the given equation.

1. True

2. False

Q.

Karan spends $Rs5000$ on food which is $\frac{5}{8}$th of his income. Karan's income is ___(in rupess).

Q. Which one of the following expressions gives a value equivalent to 3(2 + 3)?

1. 6 + 9
2. 8 + 3
3. 11 + 3
4. 10 + 1

Q.

Form a valid equation with the given solution.

$\mathrm{b}=3$

Q. The ratings received by a company for its 9 products is given. What is mean rating of the products?


Number of products Rating

Q. Which one of the following expressions gives a value equivalent to 3(2 + 3)?

1. 6 + 9
2. 8 + 3
3. 11 + 3
4. 10 + 1