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Chapter 4: Q79. (page 174)

Write the verbal sentence as an equation and also solve this

鈥淔ifteen plus a number is equal to21minus the number鈥�

Short Answer

Expert verified

The equation is 15+x=21鈭�x and the solution is x=3.

Step by step solution

01

Step  1  . Apply the concept of linear equation

In this, simply use the concept of making a linear equation by understand the statement carefully and then solve it by doing various mathematical operations.

02

Step  2  . Find the equation

Here, the statement is : Fifteen plus a number is equal to 21 minus the number

Since,

Let the number be x.

15 plus the number, gives- 15+x

It is also given that it is equal to 21 minus of the number- 21-x

So, the final equation becomes: 15+x=21-x.

03

Step -3 – Solving the equation

The equation is15+x=21鈭�x .

Simple open the bracket and make the variable and constant of the separate side and do mathematical operations,

15+x=21鈭�xx+x=21鈭�152x=6x=62x=3

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