Questions on Word Problems: Evaluation, Substitution answered by real tutors!

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Question 151680: anne buys a plant whose height is 8cm. the plant is growing at a rate of 4/5 cm per week. when will its height exceed 13 3/5 cm.: anne buys a plant whose height is 8cm. the plant is growing at a rate of 4/5 cm per week. when will its height exceed 13 3/5 cm.
Answer by jojo14344(888) About Me  (Show Source):
You can put this solution on YOUR website!
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