<u><em>Answer:</em></u>
a. Number of flour cups needed = 4 cups
b. Number of cookies that can be baked = 240 cookies
<u><em>Explanation:</em></u>
<u>We are given that:</u>
1 cup of flour is needed to make 2 dozen cookies
To solve the two parts of this question, we will simply use cross multiplication
<u>Part a:</u>
1 cup of flour .......................> 2 dozen cookies
x cups of flour ....................> 8 dozen cookies
cups
<u>Therefore</u>, 4 cups of flour are required to make 8 dozen cookies
<u>Part b:</u>
1 cup of flour .................> 2 dozen cookies
10 cups of flour ............> y dozens of cookies
dozens of cookies
This means that, 10 cups of flour can make 20 dozen cookies
<u>However</u>, here we are asked about the number of cookies, not the number of dozens
We know that 1 dozen contains 12 parts
<u>This means that:</u>
1 dozen cookies = 12 cookies
<u>Therefore:</u>
20 dozens cookies = 20 × 12 = 240 cookies
Hope this helps :)