Math Problem Statement

One number is 7 more than the other. Twice the larger is equal to four times the smaller decreased by 2. Find the numbers. understand the problem

Solution

To understand the problem, let's define the two numbers step by step:

  1. Let one number be xx (the smaller number).
  2. The other number is 7 more than the smaller number, so the larger number will be x+7x + 7.
  3. Twice the larger number is equal to four times the smaller number decreased by 2. Mathematically, this means: 2(x+7)=4x22(x + 7) = 4x - 2

Steps to solve:

  1. Expand both sides of the equation: 2(x+7)=2x+142(x + 7) = 2x + 14 The equation becomes: 2x+14=4x22x + 14 = 4x - 2

  2. Move all the xx-terms to one side and the constants to the other side: 14+2=4x2x14 + 2 = 4x - 2x Simplifying this gives: 16=2x16 = 2x

  3. Solve for xx: x=162=8x = \frac{16}{2} = 8

  4. Now that we know x=8x = 8, the larger number is x+7=8+7=15x + 7 = 8 + 7 = 15.

Final Answer:

  • The smaller number is 88.
  • The larger number is 1515.

Would you like a detailed explanation of any step? Here are 5 relative questions to explore this concept further:

  1. How would the problem change if the larger number were 10 more than the smaller one?
  2. What would happen if "three times the smaller" was compared instead of "four times"?
  3. How can we apply similar methods to solve problems with three unknown numbers?
  4. How does this relate to solving systems of equations algebraically?
  5. Can you solve this problem using a graphical approach?

Tip: Always label unknowns clearly and translate the word problem into equations step by step for clarity.

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Math Problem Analysis

Mathematical Concepts

Algebra
Linear Equations

Formulas

2(x + 7) = 4x - 2

Theorems

Balancing method for solving linear equations

Suitable Grade Level

Grades 6-8