Question

Волосы на голове человека растут примерно со скоростью 0,4 мм в сутки.Определить наибольший промежуток времени между двумя посещениями парикмахерской мальчиком который хочет носить волосы длиной не короче 3 см,но и не длиннее 5 см.

Answer 1

Узнаем разницу между длиной волос
5см-3см=2см или 20мм
вычисляем время за которое прорастет 20мм волос
t=20/4=5суток

Answer 2

Calculating the Maximum Time Interval Between Haircuts

To determine the maximum time interval between haircuts for a boy who wants to maintain hair length between 3 cm and 5 cm, we can use the given hair growth rate of approximately 0.4 mm per day.

Given: - Hair growth rate: 0.4 mm per day - Desired hair length: between 3 cm and 5 cm

Calculation

To find the maximum time interval between haircuts, we need to calculate the time it takes for the hair to grow from 3 cm to 5 cm.

1. Convert the desired hair length to millimeters: - 3 cm = 30 mm - 5 cm = 50 mm

2. Calculate the difference in length: - 50 mm - 30 mm = 20 mm

3. Use the hair growth rate to find the time it takes for the hair to grow by 20 mm: - Time = Length / Growth rate - Time = 20 mm / 0.4 mm per day - Time ≈ 50 days

Answer

Therefore, the maximum time interval between haircuts for the boy, who wants to maintain hair length between 3 cm and 5 cm, is approximately 50 days.