How many pounds are in 3.5 kg?
A) 7.7 lb
B) 1.59 lb
C) 0.629 lb
D) 1.6 lb
E) 7.70 lb
The correct answer and explanation is :
To convert kilograms (kg) to pounds (lb), we use the conversion factor:
[
1 \, \text{kg} = 2.20462 \, \text{lb}
]
So, to find how many pounds are in 3.5 kilograms, we simply multiply 3.5 kg by the conversion factor:
[
3.5 \, \text{kg} \times 2.20462 \, \frac{\text{lb}}{\text{kg}} = 7.71617 \, \text{lb}
]
Rounding this to two decimal places, we get:
[
7.72 \, \text{lb}
]
Now, let’s look at the available options:
A) 7.7 lb
B) 1.59 lb
C) 0.629 lb
D) 1.6 lb
E) 7.70 lb
The closest answer to 7.72 lb is A) 7.7 lb, though E) 7.70 lb is also close, but in terms of precision and the typical rounding for such conversions, A) is the best match for common presentation.
Explanation:
The kilogram to pound conversion involves multiplying the weight in kilograms by 2.20462 because this is the exact factor used for converting metric kilograms to imperial pounds. This conversion is crucial in contexts where weight measurements need to be standardized between the metric system (used by most countries worldwide) and the imperial system (commonly used in the United States).
Weight conversions are frequently used in various fields like science, engineering, travel, and healthcare. For example, if you’re traveling from a country that uses kilograms to a country that uses pounds, this kind of conversion is essential to understanding your luggage weight or personal weight.
When dealing with metric-to-imperial conversions, the most common approximation is to round to two decimal places, especially in everyday usage. While 7.7 lb is slightly less than the exact value of 7.72 lb, it is an acceptable approximation and would likely be reported this way in most casual contexts. Thus, A) is the most appropriate answer here.