Question

Marcus is making cookies. The recipe says 2 1/4

cups of flour are needed for each batch. Marcus wants to make 3 batches of cookies.

How many cups of flour will Marcus use?

Answer 1

6 3/4 is the amout of cups he'll use

1 Batch: 2 1/4
2 Batches: 4 2/4
3 Batches: 6 3/4

Answer 2

we know that

The recipe says
`2(1)/(4)` cups of flour are needed for each batch

so

by proportion

Find how many cups of flour will Marcus use to make
`3` batches of cookies

Convert mixed number to an improper fraction

`2(1)/(4)=2.25`

`(2.25)/(1) (cups)/(batch) =(x)/(3) (cups)/(batch) \\ \\x=2.25*3\\ \\x=6.75\ cups`

Convert to a mixed number

`6.75\ cups=6+0.75=6+(3)/(4)=6(3)/(4)\ cups`

therefore

the answer is

`6(3)/(4)\ cups`