Answer: The market sells 12 cans and 14 boxes of food.
Step-by-step explanation: Given that a market sells 6 cans of food for every 7 boxes of food and a total of 26 and boxes are sold today.
We are to find the number of cans and boxes that the market sells.
Let x and y represents the number of cans and boxes respectively sold by the market.
Then, according to the given information, we have

and
![x+y=26\\\\\Rightarrow (6)/(7)y+y=26~~~~~~~~~~~~~~~~~~~~~~~~~~[\textup{Uing equation (i)}]\\\\\Rightarrow (6y+7y)/(7)=26\\\\\Rightarrow 13y=7*26\\\\\Rightarrow y=(7*26)/(13)\\\\\Rightarrow y=14.](https://img.qammunity.org/2018/formulas/mathematics/high-school/vca18961za4sqitxzac2ql05eecy5akevk.png)
From equation (i), we get

Thus, the market sells 12 cans and 14 boxes of food.