Math Problem Statement

find two number of the sum of 65. twice the lesser number is 10 more than the greater number. Find the numbers

Solution

Let's solve this step by step.

We need to find two numbers, say xx and yy, where xx is the lesser number and yy is the greater number. According to the problem, we have two conditions:

  1. The sum of the two numbers is 65:
    x+y=65x + y = 65

  2. Twice the lesser number is 10 more than the greater number:
    2x=y+102x = y + 10

Now, let's solve these equations simultaneously.

Step 1: Express yy from the first equation

From the first equation x+y=65x + y = 65, we can express yy as: y=65xy = 65 - x

Step 2: Substitute yy into the second equation

Substitute y=65xy = 65 - x into the second equation 2x=y+102x = y + 10: 2x=(65x)+102x = (65 - x) + 10

Step 3: Simplify and solve for xx

Now, simplify the equation: 2x=65x+102x = 65 - x + 10 2x+x=752x + x = 75 3x=753x = 75 x=753=25x = \frac{75}{3} = 25

So, the lesser number xx is 25.

Step 4: Find yy using the value of xx

Substitute x=25x = 25 back into the equation y=65xy = 65 - x: y=6525=40y = 65 - 25 = 40

So, the greater number yy is 40.

Final Answer

The two numbers are 25 and 40.

Would you like more details or have any other questions?

Here are five related questions:

  1. How do you solve simultaneous linear equations?
  2. What are the methods to solve quadratic equations?
  3. How do you check if a solution to a system of equations is correct?
  4. What are some examples of word problems involving systems of equations?
  5. How can linear equations be applied in real-life situations?

Tip: Always double-check your solution by substituting the numbers back into the original equations.

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Math Problem Analysis

Mathematical Concepts

Linear Equations
Simultaneous Equations

Formulas

None

Theorems

None

Suitable Grade Level

Grades 7-9