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In 15 days, I hope u get it correct, or wait till someone else verifies!
∆h= 235-205= 30

2per day
so in 30 cm
30/2= 15
205+2d=235
2d=30
d=15
15 days after the first 60 days the height will reach 235cm.
From seed to 235cm high it takes 60+15=75 days. 
I am confused what number to put in here, 15 or 75?
I'd go with 15.

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