Math Problem Statement

Six fewer than 30 times a number is five more than eight times the number. Find the number.

Solution

To solve this problem, let's break down the statement step-by-step and translate it into an algebraic equation.

Problem Analysis

The question states:

"Six fewer than 30 times a number is five more than eight times the number."

Let’s represent the unknown number as xx.

  1. "30 times a number" can be written as 30x30x.
  2. "Six fewer than 30 times a number" means we subtract 6 from 30x30x, which gives us 30x630x - 6.
  3. "Eight times the number" is 8x8x.
  4. "Five more than eight times the number" means we add 5 to 8x8x, resulting in 8x+58x + 5.

According to the problem, these two expressions are equal: 30x6=8x+530x - 6 = 8x + 5

Solving the Equation

Now, let's solve for xx.

  1. Move all terms involving xx to one side of the equation: 30x8x=5+630x - 8x = 5 + 6

  2. Simplify both sides: 22x=1122x = 11

  3. Divide by 22 to isolate xx: x=1122=12x = \frac{11}{22} = \frac{1}{2}

Answer

The value of xx is 12\frac{1}{2}.

Conclusion

The correct answer is: 12\boxed{\frac{1}{2}}

Would you like a detailed explanation of any step or have any questions?


Here are some related questions to deepen understanding:

  1. What would the solution be if the problem stated "ten fewer than 40 times a number is equal to twelve times the number plus four"?
  2. How do you interpret phrases like "more than" or "fewer than" when forming algebraic expressions?
  3. How would the equation change if we doubled the number in all terms of the problem?
  4. What is the process for checking if your solution is correct in such word problems?
  5. How would we solve if "six fewer than 30 times a number" was instead "30 times a number minus 6 times another number"?

Tip: When solving word problems, translate each phrase step-by-step into an equation. This makes it easier to avoid mistakes.

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Math Problem Analysis

Mathematical Concepts

Algebra
Linear Equations
Word Problems

Formulas

Setting up and solving linear equations

Theorems

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Suitable Grade Level

Grades 6-8