For a barrel of oil, 20% is used in the first time, and 25% of the whole barrel is used in the second time. Six kg is used in both times. How many kg is the weight of this barrel of oil?

This barrel of oil weighs 10 kg

A barrel of oil, the first time to use 25, the second time more than the first 2 kg, there are still 3 kg in the barrel. This barrel of oil how many kg?

(3 + 2) △ 1-25-25, = 5 △ 15, = 25 (kg). A: this barrel of oil used to be 25 kg

A barrel of oil, oil and barrel weigh 16.5kg. After half use, even the barrel weighs 9.5kg. How much is the barrel? How much is the oil?

Ricardo is a qualified writer,
Barrel: 9.5 × 2-16.5 = 2.5 (kg)
Oil: 16.5-2.5 = 14 (kg)

A barrel of oil weighs 18 kg. After half use, the barrel weighs 9.5 kg. How many kg of original oil is in the barrel?

（18-9.5）*2=17

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