RML MAINS 2025
Medium
If the price of 1 liter is ₹45, then find the price of 3.5 liters.
Appeared in: RML MAINS 2025
Explanation
- The problem requires finding the total cost for a given quantity when the cost of a single unit is known.
- This is a direct application of the unitary method in mathematics.
- The total price is calculated by multiplying the quantity (3.5 liters) by the price per unit (₹45 per liter).
- The correct calculation is: 3.5 × 45 = 157.5.
Why Other Options Were Wrong
- Option A: This value is significantly lower than the correct answer. It may result from a gross miscalculation or estimating 3.5 liters as a much smaller number.
- Option B: This value is incorrect. It might be the result of incorrectly multiplying 45 by 3 and then adding an incorrect value for the 0.5 part, or rounding the quantity down to about 3.33 liters.
- Option D: This value is slightly higher than the correct answer, likely due to a small error in the multiplication process, perhaps by incorrectly rounding up during the calculation.
Related Visual
Clinical Relevance
- Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain This question tests basic arithmetic skills, specifically multiplication of a whole number with a decimal, using the unitary method as background academic context rather than a clinical decision trigger.
- While not a clinical question, numeracy is a fundamental skill for nurses.
- Nurses perform similar calculations daily for medication dosages, IV fluid rates, and converting units (e.g., lbs to kg).
- Errors in basic math can have serious patient safety consequences, such as administering an incorrect dose of medication.
How to Approach the Question
- First, identify the information given in the question: the cost of 1 unit (1 liter = ₹45).
- Next, identify what you need to find: the cost of multiple units (3.5 liters).
- Recognize that this is a simple multiplication problem. You need to scale the price of one unit to the desired number of units.
- Set up the equation: Total Cost = (Cost per liter) × (Number of liters).
- Perform the calculation: 45 × 3.5.
- To simplify the multiplication: you can calculate 45 × 3 (which is 135) and 45 × 0.5 (which is 22.5), then add them together: 135 + 22.5 = 157.5.
Concept Tested & Keywords
- Concept Tested: This question tests basic arithmetic skills, specifically multiplication of a whole number with a decimal, using the unitary method.
- Stem keywords: price, 1 liter, ₹45, 3.5 liters
- Lead-in keywords: find the price
Question ID
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