Answer:
The total number of cartons did he sale is 20 .
Step-by-step explanation:
Given as :
The total number package in each carton = 28
The total amount received after sale = $ 280
The cost of 10 noodles = $ 5
Let the total number of cartoon sale = x
According to question
∵ The number of noodles costing $5 is 10
so,The number of noodles costing $1 is
= 2
∴ The number of noodles costing $280 = 2 × 280 = 560
Now, since there are 28 packages in 1 carton
So . the number of carton did he sale = 
Or, The number of carton did he sale =
= 20
Hence The total number of cartons did he sale is 20 . Answer