At a school party there are 40 cookies. The ratio of chocolate cookies to oatmeal cookies is shown in the tape diagram. Chocolate: 5 Oatmeal: 3 How many oatmeal cookies were at the party?

Answer:

The number of Oatmeal cookies at the party were:

                                  15

Step-by-step explanation:

It is given that:

           The total number of cookies at the school party were: 40 cookies

Also the ratio of chocolate cookies to Oatmeal cookies are: 5: 3

So, let the number of chocolate cookies= 5x

and the number of Oatmeal cookies= 3x

Hence, we have:

5x+3x=40

( since number of chocolate and oatmeal cookies is equal to the total number of cookies)

i.e.

8x=40

on dividing both side of the equation by  8 we have:

      x=5

Hence, Number of chocolate cookies= 5×5=25 cookies.

and Number of Oatmeal cookies= 5×3= 15 cookies.