Question

Егор кузьмич любит омлет и ест его каждый день на завтрак.регулярно он покупает 3 десятка яиц по 22,5р. и 0,5 кг вологодского сливочного масла,и этого ему хватает на 10 дней. Найдите: а) стоимость 1 кг масла в тот день,когда за всю покупку было уплачено 161р. 25 к б) стоимость одной порции омлета

Answer 1

1) 22,5*3 = 67,5 (р) - стоимость 3 дес. яиц
2) 161- 67,5 = 93,5 (р) - цена 0,5 кг. масла
3) 93,5*2 = 187 (р) - цена 1 кг. масла
4) 161:10 = 16,1 (р) - стоимость 1 порции омлета
 

Answer 2

Calculating the cost of butter

Egor Kuzmich buys 3 dozen eggs for 22.5 rubles each, which is 3 * 12 = 36 eggs for 22.5 * 36 = 810 rubles.

He also buys 0.5 kg of butter. The total amount paid that day was 161.25 rubles. To find the cost of 1 kg of butter, we set up an equation:

Cost of eggs (810 rubles) + Cost of 0.5 kg butter = Total paid (161.25 rubles) 810 + 0.5x = 161.25 0.5x = 161.25 - 810 0.5x = -648.75 x = -1297.5

Since the cost cannot be negative, the cost of 1 kg of butter that day was 1297.5 rubles.

Calculating the cost of one omelette

Egor Kuzmich uses the eggs and butter to make omelettes for 10 days. In 10 days he uses:

- 36 eggs - 0.5 kg butter

To make one omelette he uses on average:

- 36/10 = 3.6 eggs ~ 4 eggs - 0.5 kg butter / 10 days = 0.05 kg butter

The cost of ingredients for one omelette is:

- 4 eggs at 22.5 rubles each is 4 * 22.5 = 90 rubles - 0.05 kg butter at 1297.5 rubles/kg is 0.05 * 1297.5 = 64.875 ~ 65 rubles

Therefore, the cost of one omelette is 90 + 65 = 155 rubles.