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Two fifths of a barrel of oil is used. The second time, it is 5 kg less than the first time. There are 15 kg left in the barrel. How many kg is the barrel of oil
x*2/5+(x*2/5-5)+15=x
x=50
A barrel of oil is 15 kg. Two fifths of it is used. How many kg are left
15 × 2 / 5 = 6kg, 15-6 = 9kg, 9kg left, right?
A barrel of oil is 15 kg. One fifth of it is used for the first time and one fifth for the second time. How many kg are left?
15*(1-1/5)=12
12*(1-1/5)=9.6
A barrel of oil weighs 15 kg. Two fifths of it is used. How many kg are left?
A barrel of oil weighs 15 kg. If you use 2 / 5 kg, how many kg are left?
15-2 / 5 = 15-0.4 = 14.6kg
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