Question 28 of 480
Tope bought X oranges at N5.00 each and some mangoes at N4.00 each. if she bought twice as many mangoes as oranges and spent at least N65.00 and at most N130.00, find the range of values of X.
- A. 4≤X≤5
- B. 5≤X≤8
- C. 5≤X≤10
- D. 8≤X≤10
Correct Answer:
C
Explanation
To solve the problem, we need to analyze the information given about Tope's purchases of oranges and mangoes. Let's break it down step-by-step.
### Step 1: Define the Variables
- Let \( X \) be the number of oranges Tope bought.
- The cost of each orange is N5.00, so the total cost for oranges is \( 5X \).
- Tope bought twice as many mangoes as oranges, which means she bought \( 2X \) mangoes.
- The cost of each mango is N4.00, so the total cost for mangoes is \( 4(2X) = 8X \).
### Step 2: Set Up the Total Cost Equation
The total cost for both oranges and mangoes can be expressed as:
\[
\text{Total Cost} = \text{Cost of Oranges} + \text{Cost of Mangoes} = 5X + 8X = 13X
\]
### Step 3: Establish the Range for Total Cost
According to the problem, Tope spent at least N65.00 and at most N130.00. Therefore, we can set up the following inequality:
\[
65 \leq 13X \leq 130
\]
### Step 4: Solve the Inequalities
Now, we will solve the inequalities for \( X \).
1. **Lower Bound:**
\[
65 \leq 13X
\]
Dividing both sides by 13:
\[
X \geq \frac{65}{13} = 5
\]
2. **Upper Bound:**
\[
13X \leq 130
\]
Dividing both sides by 13:
\[
X \leq \frac{130}{13} = 10
\]
### Step 5: Combine the Results
From the calculations above, we find:
\[
5 \leq X \leq 10
\]
This means that the range of values for \( X \) is from 5 to 10, inclusive.
### Step 6: Identify the Correct Option
Looking at the options provided:
- A. \( 4 \leq X \leq 5 \) (Incorrect, as \( X \) must be at least 5)
- B. \( 5 \leq X \leq 8 \) (Partially correct, but does not include the full range up to 10)
- C. \( 5 \leq X \leq 10 \) (Correct, as it matches our derived range)
- D. \( 8 \leq X \leq 10 \) (Incorrect, as it does not include values below 8)
Thus, the correct answer is **C. \( 5 \leq X \leq 10 \)**.
### Summary of Key Points
- Tope's total expenditure is calculated based on the number of oranges and mangoes.
- The inequalities derived from the total cost give the range for \( X \).
- The correct range of values for \( X \) is from 5 to 10.
- The other options either do not cover the full range or are incorrect based on the calculations.
### Revision Summary
- Define variables clearly for the problem.
- Set up equations based on the information given.
- Solve inequalities carefully to find the range of values.
- Verify the answer against the provided options to ensure correctness.