A barrel of diesel oil weighs 120 kg. After three-quarters of the oil is poured out, there is 45 kg left. How many kg does this barrel of diesel oil weigh?

A barrel of diesel oil weighs 120 kg. After three-quarters of the oil is poured out, there is 45 kg left. How many kg does this barrel of diesel oil weigh?

Oil = (120-45) △ 3 / 4 = 100 kg