Question 151680
Goal: 13-3/5 cm
Present: 8 cm
difference: (13-3/5)-(8)= 5-3/5 cm =5.6cm-------> this is the one the plant need to attain at a rate of 4/5 = 0.8 cm per week.
= {{{5.6cm/(0.8cm /week)}}}
={{{7 weeks}}} 
In 7 weeks the plant reaches 13-3/5 cm, plus 1 more week= 4/5+(13-3/5)=14-2/5 cm
After {{{8 weeks}}} it exceeded the height 13-3/5 cm.
Thank you,
Jojo