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Chapter 2: Q. 93 (page 128)

Three times the sum of a number and nine is 12. Find the number.

Short Answer

Expert verified

The number is -5.

Step by step solution

01

Step 1. Given information

Three times the sum of a number and nine is 12.

02

Step 2. Forming linear equation

Let the required number be x.

Then,3number+9=12

03

Step 3. Finding the number

3(x+9)=123x+27=123x=12-273x=-15x=-5

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