brad is planting flowers in a grid-like pattern in his garden. he is trying to determine the possible number of rows and columns in which he can plant his flowers. he determines that two possibilities are 8 rows and 25 columns or 10 rows and 20 columns. brad realizes that he could also use 5 rows in his garden. how many columns would complete a 5-row garden? a. 30 b. 40 c. 50 d. 60