Jane plants

Jane plants flowers in the garden. If she planted 12 every hour instead of 9 flowers, she would finish the job an hour earlier. How many flowers does she plant?

Correct answer:

n =  36

Step-by-step explanation:


n = 9t
n = 12(t-1)

n = 9·t
n = 12·(t-1)

n-9t = 0
n-12t = -12

Row 2 - Row 1 → Row 2
n-9t = 0
-3t = -12


t = -12/-3 = 4
n = 0+9t = 0+9 · 4 = 36

n = 36
t = 4

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