A barrel of oil weighs 3 / 4 of a barrel. After half of the oil is poured out, there is only 1 / 2 of a kilogram left. How many kilos does the barrel weigh?
3 / 4-2 (3 / 4-1 / 2) = 1 / 4kg
There are four barrels of oil. If 6 kg is poured out of each barrel, the remaining oil in the four barrels is exactly equal to the weight of the original barrel of oil. How many kg is the weight of the original barrel of oil?
To calculate! To calculate
Suppose the weight of oil per barrel is XKG, then 4 (X-6) = X
x=8
A: it used to weigh 8 kg per barrel