Given a rectangle with the area of 30in2 and its length is 6in. Find its width.
The picture below shows the rectangle with the length of 6in and the width of w.
Since the value of the area is given as 30in2, we can substitute A with 30. Similarly, since the length is given as 6in, we can substitute l with 6. This is shown below:
Now, we have 6w = 30. Notice that, to find w, we need to remove 6. We can do so by dividing both sides of the equation with 6.
Now, the calculated number 5, has no meaning until we include the unit for it. Since the area is in inch2, w will be in inch. Hence:
Therefore, the answer is D.
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