Math Expression: Area of a Rectangle Practice Question

Given a rectangle with the area of 30in² and its length is 6in. Find its width.

Step 1

The picture below shows the rectangle with the length of 6in and the width of w.
Step 2

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:
Step 3

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.
Step 4

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:

w = 5 in
Step 5

Therefore, the answer is D.