Answer:
15 inches in 210 days
Explanation:
First find the growth rate in inches/day:
50 inches
--------------- = (1/2) inch/wk = (1/14) inch/day
(100 wks)
Then 210 days 1 inch
------------- * --------------- = 15 inches
1 14 day
The plant grew 15 inches in 210 days.