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Question

If 24 is subtracted from three times an unknown number, the difference is 258. What is the unknown number?

The correct answer is

94

Solving the Algebra Word Problem

This problem requires us to identify an unknown number using the information provided. We are told that if we take three times this number and then subtract 24 from the result, we get 258.

Translating the Problem into an Equation

Let's denote the unknown number as '$x$'. We can translate the sentence into a mathematical equation step-by-step:

  • "Three times an unknown number" is represented as $3x$.
  • "24 is subtracted from three times an unknown number" translates mathematically to $3x - 24$.
  • The problem states that this difference "is 258".

Therefore, the equation we need to solve is:

$$3x - 24 = 258$$

Step-by-Step Solution

Our goal is to find the value of '$x$'. We can do this by isolating '$x$' on one side of the equation:

  1. Isolate the term with '$x$': Add 24 to both sides of the equation to cancel out the subtraction. $$3x - 24 + 24 = 258 + 24$$ $$3x = 282$$
  2. Solve for '$x$': Divide both sides by 3 to find the value of the unknown number. $$\frac{3x}{3} = \frac{282}{3}$$ $$x = 94$$

Verifying the Answer

To ensure the answer is correct, let's substitute $x = 94$ back into the original condition:

  • Calculate three times the number: $3 \times 94 = 282$.
  • Subtract 24 from the result: $282 - 24 = 258$.

Since the result is 258, which matches the value given in the problem, the unknown number is indeed 94.

Final Answer

The unknown number is 94.

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Important Questions from Linear Equation in 1 Variable

  1. The sum of three fractions A, B, and C, A > B > C, is \(\frac{121}{60}\) . When C is divided by B, the resulting fraction is  \(\frac{9}{10}\) , which exceeds A by  \(\frac{3}{20}\) . What is the difference between B and C?

  2. 7 is added to a certain number and the sum is multiplied by 5. The product is then divided by 3 and 4 is subtracted from the quotient. If the result comes to 16, then what is the original number?

  3. If the measure of one angle of a right triangle is 30° more than the measure of the smallest angle, then the measure of the smallest angle is:

  4. A man has equal number of five, ten and twenty rupee notes amounting to Rs. 385. Find the total number of notes?

  5. The sum of three consecutive number is 126. Find the highest number?

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