Solve the problem.
31)
For a party, Mary has to bake 5 cakes, 3 pies, and 4 trays of cookies. One cake requires 2.5 cups of flour, one pie requires 1.25 cups of flour, and one tray of cookies needs 0.75 cups of flour. How much flour in all does Mary need to do the baking for the party?
5*2.5=12.5 cups needed for cakes
3*1.25=3.75 cups needed for pies
4*.75=3 cups needed for cookies
3+3.75+12.5= 19.25 cups needed in total
To solve this problem, we need to multiply the number of each item by the amount of flour required for each item and then add them all together.
Let's start by calculating the amount of flour needed for the cakes:
Number of cakes: 5
Flour per cake: 2.5 cups
Total flour needed for cakes = Number of cakes x Flour per cake
Total flour needed for cakes = 5 x 2.5 = 12.5 cups
Next, let's calculate the amount of flour needed for the pies:
Number of pies: 3
Flour per pie: 1.25 cups
Total flour needed for pies = Number of pies x Flour per pie
Total flour needed for pies = 3 x 1.25 = 3.75 cups
Finally, let's calculate the amount of flour needed for the trays of cookies:
Number of trays of cookies: 4
Flour per tray of cookies: 0.75 cups
Total flour needed for trays of cookies = Number of trays of cookies x Flour per tray of cookies
Total flour needed for trays of cookies = 4 x 0.75 = 3 cups
Now, let's add up all the amounts of flour needed:
Total flour needed = Total flour needed for cakes + Total flour needed for pies + Total flour needed for trays of cookies
Total flour needed = 12.5 + 3.75 + 3 = 19.25 cups
Therefore, Mary needs a total of 19.25 cups of flour to do the baking for the party.