Ram weighs 45kg and mary weighs m kg. write an expression for their combined weight.
The correct answer and explanation is:
The expression for Ram and Mary’s combined weight is:
45 + m
Where:
- 45 represents Ram’s weight in kilograms.
- m represents Mary’s weight in kilograms, which is an unknown value.
Explanation:
In this scenario, the problem gives Ram’s weight as 45 kg, and Mary’s weight is represented as “m” because the exact value of her weight is not provided. To find their combined weight, you simply add their individual weights together.
Mathematically, this is an example of an addition expression, where the sum of two values is calculated. The value of “m” can change depending on what Mary’s weight actually is, but as long as you know the value of “m,” you can plug it into the expression to find their total weight.
This type of expression is useful when you’re dealing with unknown quantities in algebra, where you don’t yet know a specific number but can represent it with a variable, like “m.” Variables are commonly used to generalize problems, so that even when you don’t have all the specific information, you can still set up the problem and solve it when the necessary values are provided.
In this case, if you were given Mary’s actual weight, say 50 kg, you would substitute 50 for “m” in the expression:
45 + 50 = 95 kg
This result shows that their combined weight is 95 kg.
Thus, the expression 45 + m is a way to represent the total weight of both Ram and Mary, regardless of what Mary’s specific weight might be.