A drum of oil that weighs 1.2 kilograms. Uses half the oil and notices that the half-full drum weighs 700 grams. What is the weight of the empty drum?

Question

If I had a drum of oil that weighs 1.2 kilograms and I use half the oil and notices that the half-full drum weighs 700 grams. What is the weight of the empty drum?

Answer 1

1.2 kg = 1.2(1000) = 1200 g

 

1200 - 700 = 500 g for half the oil, so all the oil weighs 1000 g or 1 kg, so the drum weighs 0.2 kg, or 200 g.