Answer:
More than 7
Explanation:
Given that:
Joshua's goal is to sell more than 20 items at a farmer's market.
Number of items already sold = 6
So, number of more items to be sold > Total number of items to be sold - Number of items already sold > 20 - 6 > 14
Given that each customer buys 2 items.
Let
be the number of customers.
So, number of items bought be the customers = Number of items bought by each customer multiplied by the number of customers =
![2c](https://img.qammunity.org/2021/formulas/mathematics/high-school/aphi62phzqlo7mnfx5sd11g0j4v7r4399o.png)
And as per the question statement,
Number of more items to be sold > 14 (as calculated in above step)
![2c>14\\\Rightarrow \bold{c>7}](https://img.qammunity.org/2021/formulas/mathematics/high-school/fw0q65r34wsx8i2jibu808gsnl1blxh3lh.png)
Therefore, the answer is: More than 7 additional customers are required.