Question

Mary has 21 yards of white ribbon and 3 yards of black ribbon. Which model could Mary use to find the difference between the lengths of the white and black ribbon? White: Black: White: Black: White: Black: White: Black: AA в) В D

Answer 1

To find the difference in length between Mary's white and black ribbons, subtract the length of the black ribbon (3 yards) from the white ribbon (21 yards), resulting in an 18-yard difference.

Step-by-step explanation:

The difference between the lengths of the white and black ribbon that Mary has can be found with simple subtraction. Mary has 21 yards of white ribbon and 3 yards of black ribbon. To find the difference between the white and black ribbon, we subtract the length of the black ribbon from the length of the white ribbon.

To demonstrate the calculation:

1. First, take the total length of the white ribbon, which is 21 yards.
2. Then, subtract the total length of the black ribbon, which is 3 yards from the white ribbon length.
3. The result will give us the difference in length.

So, the calculation is 21 yards - 3 yards = 18 yards. Therefore, Mary has 18 yards more white ribbon than black ribbon.

Answer 2

`D`

Step-by-step explanation:

Here, we want to get the model that could be used to find the difference between the two

What we have to do here is to find the model that supports the breakdown

For the first one, we have two completely filled ones and one singly filled one out of 6

For the second one, we have 3 completely filled ones and 2 out of 3 filled ones (this is same as 3 completely filled, then 4 out of 6 filled)

The correct answer choice here is thus the last option