Question

В семье 4 чел. каждый тратит в день 30 л холодной воды и 20л горячей воды. Сколько надо заплатить за воду в конце месяца, содержащего 30 дней если стоимость 1м3 холодной воды=30 руб, 1м3 горячей воды-140 руб?

Answer 1

В день на человека 30л=0,03 куб.м. холодной и 0,02 куб.м. горячей воды
в день на семью 0,03*4=0,12 куб.м.   0,08 куб м горячей
семья за месяц  0,12*30=3,6 куб м по цене 30 руб.
3,6*30=108 руб
за месяц горячей 0,08*30=2,4 куб м  по цене 140 руб
2,4*140=336руб

итого 108+336=444 рубля

Answer 2

Calculation of Water Usage and Cost

To calculate the total cost of water at the end of the month, we need to determine the total volume of cold and hot water used by the family and then multiply it by the respective costs per cubic meter.

Given the following information: - There are 4 people in the family. - Each person uses 30 liters of cold water and 20 liters of hot water per day. - The cost of 1 cubic meter (1000 liters) of cold water is 30 rubles. - The cost of 1 cubic meter (1000 liters) of hot water is 140 rubles.

Let's calculate the total volume of water used by the family in one month:

- Total volume of cold water used per day: 4 people * 30 liters/person = 120 liters/day. - Total volume of cold water used in 30 days: 120 liters/day * 30 days = 3600 liters.

- Total volume of hot water used per day: 4 people * 20 liters/person = 80 liters/day. - Total volume of hot water used in 30 days: 80 liters/day * 30 days = 2400 liters.

Now, let's calculate the total cost of water:

- Cost of cold water: 3600 liters / 1000 liters/m3 = 3.6 m3 * 30 rubles/m3 = 108 rubles. - Cost of hot water: 2400 liters / 1000 liters/m3 = 2.4 m3 * 140 rubles/m3 = 336 rubles.

Therefore, the total cost of water at the end of the month would be 108 rubles for cold water and 336 rubles for hot water, resulting in a total of 444 rubles.