Question

the height of a plant is increasing at the rate of 8 cm per week. after how many weeks will the height of the plant be 71cm if the present height of the plant is 15 cm​

Answer 1

Answer:

71-15=56 plant need 56 cm to grow more

8cm in 7days

8/7cm in 1 day

>> 8/7×56 = 64 days

Answer 2

Initial height of the plant=15 cm

Final height of the plant =71cm

Rate of increase=8cm/week

Let the number of weeks be n.

15 + 8n = 71

8n = 71-15 = 56

n=56/8 = 7

Number of weeks it will take for the plant to be 71 cm is 7 weeks.

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