Solution: Roberto needs 15 cookies and 5 brownies for 10 plates.
Explanation:
It is given that for every 4 plates Roberto needs 6 cookies and 2 brownies and we have to find the number of cookies and brownies required for 10 plates.
First of all we have to find the number of cookies and brownies for one plate.
4 plates = 6 cookies
1 plate [tex]=\frac{6}{4}[/tex] cookies
10 plates = [tex]\frac{6}{4}(10)=15[/tex]
For 10 plates the 15 cookies are required.
4 plates = 2 brownies
1 plate [tex]=\frac{2}{4}[/tex] brownies
10 plates = [tex]\frac{2}{4}(10)=5[/tex]
For 10 plates the 5 brownies are required.
Therefore, Roberto needs 15 cookies and 5 brownies for 10 plates.
