Question

За 7 дней в столовой израсходовали 21 кг масла.На сколько дней при той же норме расхода хватит 36 кг масла? На сколько дней хватило бы этого масла,если бы каждый день расходовали на 1 кг больше?

Answer 1

21кг:7дн=3кг в день расходовали масла

36кг:3кг/д=12 дней хватит 36кг масла

3+1=4кг/д  расходовали бы

36кг:4кг/д=9 дней хватило бы

Answer 2

Problem Analysis

We are given that 21 kg of oil was consumed in 7 days in a cafeteria. We need to determine how many days the same rate of consumption would last if there were 36 kg of oil. Additionally, we need to find out how many days the 36 kg of oil would last if each day the consumption increased by 1 kg.

Solution

Let's solve the problem step by step.

1. Determine the rate of consumption per day: - To find the rate of consumption per day, we divide the total amount of oil consumed (21 kg) by the number of days (7 days). - Rate of consumption per day = 21 kg / 7 days = 3 kg/day.

2. Calculate the number of days the 36 kg of oil would last at the same rate of consumption: - To find the number of days the 36 kg of oil would last, we divide the total amount of oil (36 kg) by the rate of consumption per day (3 kg/day). - Number of days = 36 kg / 3 kg/day = 12 days.

3. Calculate the number of days the 36 kg of oil would last if the consumption increased by 1 kg each day: - To find the number of days the 36 kg of oil would last with an increased consumption rate, we need to calculate the new rate of consumption per day. - The new rate of consumption per day is the original rate (3 kg/day) plus the increase in consumption (1 kg/day). - New rate of consumption per day = 3 kg/day + 1 kg/day = 4 kg/day. - To calculate the number of days, we divide the total amount of oil (36 kg) by the new rate of consumption per day (4 kg/day). - Number of days = 36 kg / 4 kg/day = 9 days.

Answer

Based on the given information: - If the rate of consumption remains the same, 36 kg of oil would last for 12 days. - If the consumption increases by 1 kg each day, 36 kg of oil would last for 9 days.

Please let me know if anything is unclear or if you need further assistance!