I need 30 desks in a classroom I have 4 rows with 5 chairs in each how many more do I need

well, you have 5*4 = 20

How many more to get 30?

6 Rows in all (2 more rows of 5 in each row)

To find out how many more desks you need, you'll first need to determine how many chairs are already available in the 4 rows of the classroom. Since each row has 5 chairs, you can multiply the number of chairs per row (5) by the number of rows (4) to find the total number of chairs available.

4 rows x 5 chairs/row = 20 chairs

Next, subtract the number of chairs you already have from the total number of desks you need (30) to find out how many more desks you need.

Desks needed - Chairs already available = Desks still needed
30 desks - 20 chairs = 10 more desks needed

Therefore, you need 10 more desks to have a total of 30 desks in the classroom.