Answer:
More than 7
Step-by-step 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 [tex]c[/tex] 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 = [tex]2c[/tex]
And as per the question statement,
Number of more items to be sold > 14 (as calculated in above step)
[tex]2c>14\\\Rightarrow \bold{c>7}[/tex]
Therefore, the answer is: More than 7 additional customers are required.