Explanation:
210 rows of sunflower
each row = 342 sunflowers
210 rows = 71820 sunflowers (210×342)
harvesting estimation= 71820 sunflowers in 18 hours
so 1 hour=?
71820÷18=3990. 3990×18=71820
that means, farmer Brown will be harvesting 3990 numbers of sunflower each hour.
have a great day :)