
If twelve less than 3 times a number is 27, then the number is ____?
A) 29
B) 39
C) 65
D) 13
Answer
508.2k+ views
1 likes
Hint:
first of all, we’ll assume the required number as x then we’ll find 3 times of this number. After this, we’ll subtract 12 from that number. this will give us a linear equation in one variable and we’ll solve that for known x.
Complete step by step solution:
At first, Let the number be x.
Now according to the question, multiplying the number by 3 and then subtracting 12 from it is will get 27.
So, the equation will be
Solving
So, x = 13
Therefore, the required number is 13.
Note:
The basic rule of algebra regarding the linear equations is, we need to get as many equations as many knowns we have. Given problem was univariate. which mean of a single variable. we also have a double variable or even triple variate linear equation in mathematics. They have their own methods to solve.
first of all, we’ll assume the required number as x then we’ll find 3 times of this number. After this, we’ll subtract 12 from that number. this will give us a linear equation in one variable and we’ll solve that for known x.
Complete step by step solution:
At first, Let the number be x.
Now according to the question, multiplying the number by 3 and then subtracting 12 from it is will get 27.
So, the equation will be
Solving

So, x = 13
Therefore, the required number is 13.
Note:
The basic rule of algebra regarding the linear equations is, we need to get as many equations as many knowns we have. Given problem was univariate. which mean of a single variable. we also have a double variable or even triple variate linear equation in mathematics. They have their own methods to solve.
Latest Vedantu courses for you
Grade 11 Science PCM | CBSE | SCHOOL | English
CBSE (2025-26)
School Full course for CBSE students
₹41,848 per year
Recently Updated Pages
Master Class 11 Physics: Engaging Questions & Answers for Success

Master Class 11 Chemistry: Engaging Questions & Answers for Success

Master Class 11 Biology: Engaging Questions & Answers for Success

Class 11 Question and Answer - Your Ultimate Solutions Guide

Master Class 11 Business Studies: Engaging Questions & Answers for Success

Master Class 11 Computer Science: Engaging Questions & Answers for Success

Trending doubts
In Indian rupees 1 trillion is equal to how many c class 8 maths CBSE

How many ounces are in 500 mL class 8 maths CBSE

How many ten lakhs are in one crore-class-8-maths-CBSE

Name the states through which the Tropic of Cancer class 8 social science CBSE

Explain land use pattern in India and why has the land class 8 social science CBSE

One cusec is equal to how many liters class 8 maths CBSE
