You have 48 counters the first row has 3 counters the rest of the rows have 2 more counters than the first row how many rows do you need to use all of the 48 counters?

You will need to have 10 rows in total.

Below shows the number of rows, compared to the number of counters in each row to the total after each row is added:

1: 3. 3

2: 5. 8

3: 5. 13

4: 5. 18

5: 5. 23

6: 5. 28

7: 5. 33

8: 5. 38

9: 5 43

10: 5 48