A cookie recipe requires 3 teaspoons of baking soda for 36 cookies. If the baker would like to make 480 cookies, how much baking soda will be required? a
13.33 teaspoons
b
12 teaspoons
c
40 teaspoons
d
108 teaspoons

C

Step-by-step explanation:

This is a straight proportion question. Many things can be solved with a proportion. This is a good example of what is possible.

Formula

3 teaspoons       x

36 cookies        480 cookies

Notice that in the end, the units of teaspoons will be left. Multiply both sides by 480

3 teaspoons * 480 cookies

           =  X

36 cookies

Notice the cookies cancel

3 teaspoons * 480

    =  x

36

x = 1440/36 teaspoons.

x = 40 teaspoons

C

it is a. 4.2 because 7.6-3.4 gets the remaining length of 4.2. i might be wrong but i am pretty sure this is the answer.