Question

choose the following ​

Answer 1

Answer:

1. 10

2. 2x-7=11

Step-by-step explanation:

1. 7n+45=115

7n=70

n=10

2. 2x-7=11

Answer 2

$\red\bigstar$Answer:

1. Option (B) i.e. 10
2. Option (C) i.e. 2x - 7 = 11

$\red\bigstar$Given:

1. The equation is 7n + 45 = 115
2. Statement - Two times of number x minus 7 is 11.

$\red\bigstar$To find:

1. The value of n in the given equation.
2. Equation for the given statement.

$\red\bigstar$ Solution:

1.

7n + 45 = 115

$\implies$ 7n = 115 - 45

$\implies$ 7n = 70

$\implies$ n = $\cancel\dfrac{70}{7}$

$\implies$ $\boxed{n\: = \:10\:}$

$\boxed{\therefore\:n\: = \:10\:}$

2.

Given: Two times of number x minus 7 is 11.

Answer: Two times of number x :

$\hookrightarrow$ 2x

Then 7 is subtracted,

$\hookrightarrow$ 2x - 7

Result is 11,

$\hookrightarrow$ 2x - 7 = 11

$\therefore$ the equation is $\boxed{2x\: -\: 7\: = \:11\:}$

$\red\bigstar$ Concepts used:

• Transposition Method
• Equating two expressions

$\red\bigstar$ Extra - Information:

• In an equation, there must be a variable and the two expressions should be equated by ' = '.
• We need an equation for one variable, two equations for two different variable and so on.