Solve the Age Equation: If Gabriel is 14 + Simon, When Does Their Total Not Exceed 35?

Age Inequalities with Integer Constraints

Gabriel is 14 years older than his brother Simon.

Given that the sum of their ages does not exceed 35, roughly what is Simon's age?

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1

Understand the problem

Gabriel is 14 years older than his brother Simon.

Given that the sum of their ages does not exceed 35, roughly what is Simon's age?

2

Step-by-step solution

To solve this problem, we will follow these steps:

  • Step 1: Write the equation based on the problem statement.

  • Step 2: Simplify and solve the inequality.

  • Step 3: Identify the range for Simon's age.

Now, let's work through each step:
Step 1: The problem states that Gabriel is 14 years older than Simon, so if Simon's age is S S , Gabriel's age is S+14 S + 14 . Given that the sum of their ages does not exceed 35, we can write: (S)+(S+14)35(S) + (S + 14) \leq 35

Step 2: Simplify the inequality:
2S+14352S35142S21 \begin{aligned} 2S + 14 &\leq 35 \\ 2S &\leq 35 - 14 \\ 2S &\leq 21 \end{aligned} Divide both sides by 2:
S10.5S \leq 10.5

Step 3: Given the inequality, Simon’s age is any number greater than or equal to 0 but less than or equal to 10.5. Since Simon must be a whole number, Simon's possible ages range from 0 to 10.

After reviewing the given choices, the correct answer falls within the range:
Between 0 and 10.5

3

Final Answer

Between 0 and -10.5

Key Points to Remember

Essential concepts to master this topic
  • Setup: Define variables then translate word problem into inequality
  • Technique: Combine like terms: S + (S + 14) becomes 2S + 14 ≤ 35
  • Check: Verify boundary: when S = 10.5, total is exactly 35 ✓

Common Mistakes

Avoid these frequent errors
  • Forgetting that ages must be non-negative whole numbers
    Don't just solve S10.5 S ≤ 10.5 and stop there = missing realistic constraints! Ages can't be negative or fractional in real life. Always consider that Simon's age must be between 0 and 10 (whole numbers only).

Practice Quiz

Test your knowledge with interactive questions

Solve the following inequality:

\( 3x+4 \leq 10 \)

FAQ

Everything you need to know about this question

Why is the answer 'Between 0 and 10.5' when ages should be whole numbers?

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The mathematical solution is S10.5 S ≤ 10.5 , but in real life, Simon's age must be a whole number from 0 to 10. The range '0 to 10.5' includes all possible whole number ages.

Can Simon really be 0 years old?

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Mathematically, yes! The inequality allows it. However, the problem asks for 'roughly what is Simon's age', so ages like 8, 9, or 10 are more realistic answers.

How do I set up the inequality from the word problem?

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Break it down: Simon = S, Gabriel = S + 14, and their sum ≤ 35. So: S+(S+14)35 S + (S + 14) ≤ 35

What if I got S ≤ 21 instead of S ≤ 10.5?

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You forgot to divide by 2! After getting 2S21 2S ≤ 21 , you must divide both sides by 2 to isolate S: S10.5 S ≤ 10.5

Why isn't the answer 'More than 10.5' if that's the maximum?

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The inequality is S10.5 S ≤ 10.5 (less than or equal to), not greater than! Simon's age must be at most 10.5, so it's between 0 and 10.5.

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