Mr.Johnson sold 20 cartons of noodles.
SOLUTION:
Given, Mr. Johnson imported some cartons of noodles. There were 28 packages of noodles in each carton.
He then sold 10 packages of noodles for [tex]\$5[/tex]
He received [tex]\$280[/tex] from the sale of noodles.
Now, we know that, for [tex]\$5 \rightarrow 10[/tex] noodles packages
Then, for [tex]\$280 \rightarrow[/tex] (let it be) n noodles packages
So, by criss cross method, [tex]n \times 5=10 \times 280 \rightarrow n=2 \times 280 \rightarrow n=560[/tex]
Therefore, he sold 560 noodle packages.
Now, we know that, 28 packages [tex]\rightarrow[/tex] 1 carton
Then, 560 packages [tex]\rightarrow[/tex] (let it be ) m cartons
So, by criss cross method, [tex]m \times 28=1 \times 560 \rightarrow m=20[/tex]
Hence, he sold 20 cartons.
