Answer:
4
Step-by-step explanation:
Let's say B is the number of boys and T is the number of teachers.
T / (B + 18) = 2/21
B/18 = 4/3
Solve the second equation for B.
B = 24
Plug into the first equation to find T.
T / (24 + 18) = 2/21
T = 4
61 + 4x = y
61 : starting tree height
4x : 4 times however many months pass
y : total height after x months.
you are absolutely correct .........
c :))))))))))