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You can solve this problem using equation.
Let x be the unknown number.
Write equation as you read the problem
12x - 13 = 611.
Simplify and find x
12x = 611 + 13
12x = 624
x = 624/12 = 52.
ANSWER. x= 52.
CHECK. 12*52 - 13 = 611. ! correct !
Solved.
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You can solve it MENTALLY without using equations.
For it, make the inverse arithmetic operations in reverse order:
- First, add 13 to 611 mentally and get 624.
- Next, divide 624 by 12. You will get the same answer 52.
Completed.
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If you want to learn on how to solve simple and simplest linear equations, read the lesson
- HOW TO solve a linear equation
in this site.
Consider this lesson as your textbook, handbook, tutorials and (free of charge) home teacher.
Happy learning (!)