Question

При переработке нефти получают 30% керосина . сколько тонн нефти было переработано если выход керосина составил: а) 20 т; б) 12 т; в) 42,2 т

Answer 1

А) 20 : 0,3 = 66. 2/3 т нефти для 20 т керосина
б) 12 : 0,3 = 40 т нефти для 12 т керосина 
в) 42,2 : 0,3 = 140.2/3 т нефти для 42,2 т керосина

Answer 2

Calculating the Amount of Processed Oil

To calculate the amount of oil processed, we can use the given information about the yield of kerosene from the oil.

Given: - Yield of kerosene: - a) 20 t - b) 12 t - c) 42.2 t

We know that the yield of kerosene is 30% of the processed oil. We can use this information to calculate the amount of oil processed for each given yield of kerosene.

Calculation for Yield of 20 t Kerosene

To calculate the amount of oil processed for a yield of 20 t of kerosene: - Let's denote the amount of oil processed as "x" tons. - The yield of kerosene is 30% of the processed oil, so 30% of x is equal to 20 t.

Using this information, we can calculate the amount of oil processed for a yield of 20 t of kerosene.

Calculation: - 30% of x = 20 t - x = (20 t) / (30%) - x = 66.67 t

So, if the yield of kerosene is 20 t, then the amount of oil processed is approximately 66.67 tons.

Calculation for Yield of 12 t Kerosene

To calculate the amount of oil processed for a yield of 12 t of kerosene: - Let's denote the amount of oil processed as "y" tons. - The yield of kerosene is 30% of the processed oil, so 30% of y is equal to 12 t.

Using this information, we can calculate the amount of oil processed for a yield of 12 t of kerosene.

Calculation: - 30% of y = 12 t - y = (12 t) / (30%) - y = 40 t

So, if the yield of kerosene is 12 t, then the amount of oil processed is 40 tons.

Calculation for Yield of 42.2 t Kerosene

To calculate the amount of oil processed for a yield of 42.2 t of kerosene: - Let's denote the amount of oil processed as "z" tons. - The yield of kerosene is 30% of the processed oil, so 30% of z is equal to 42.2 t.

Using this information, we can calculate the amount of oil processed for a yield of 42.2 t of kerosene.

Calculation: - 30% of z = 42.2 t - z = (42.2 t) / (30%) - z = 140.67 t

So, if the yield of kerosene is 42.2 t, then the amount of oil processed is approximately 140.67 tons.

Conclusion

Based on the given yields of kerosene: - For a yield of 20 t kerosene, the amount of oil processed is approximately 66.67 tons. - For a yield of 12 t kerosene, the amount of oil processed is 40 tons. - For a yield of 42.2 t kerosene, the amount of oil processed is approximately 140.67 tons.