A barrel of oil, the first use of two fifths, the second use of one third, there are still 8 kg. How many kg of this barrel of oil?

thirty

The first time you use 13 liters of a barrel of oil is exactly 4 liters. The second time you use 14 liters of this barrel of oil, how many liters are left?

4 △ 13-4-4 △ 13 × 14 = 12-4-3 = 5 (liter); a: there are 5 liters left

A barrel of oil, the first use of 12 kg, the second use of the remaining 13, the remaining 12 kg. How many kg of this barrel of oil?

A: this barrel of oil is 30kg

A barrel of oil, the first use of 12 kg, the second use of the remaining 13, the remaining 12 kg. How many kg of this barrel of oil?

A: this barrel of oil is 30kg

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