A barrel of oil weighs 56 kg, and half of it weighs 29.4 kg. How much does this barrel weigh?

A barrel of oil weighs 56 kg, and half of it weighs 29.4 kg. How much does this barrel weigh?

Oil weight = (56-29.4) × 2 = 53.2kg
Barrel weight = 56-53.2 = 2.8kg

A basket of fresh fish weighs 56 kg. First sell half of the fresh fish, and then sell the remaining half. At this time, the basket weighs 17 kg. How many kg does the basket weigh?

(56-17) / [(1-12) × 12 + 12] = 39 ^ (12 × 12 + 12), = 39 ^ (14 + 12), = 39 ^ (34), = 52 (g); a: fresh fish weighs 52 kg

There is a barrel of oil. Two fifths of it was taken out for the first time, and 3000 grams for the second time. There are still 21 kilograms left. How many kilograms does this barrel of oil weigh?

Hello
The original (21 + 3) / (1-2 / 5) = 24 / 3 / 5 = 40 kg
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The first time a barrel of oil poured out all 25, the second time poured out all 13, there are still 125 kg, how many kg of this barrel of oil? (solved by equation)

Suppose that the barrel of oil is originally XKG, x-25x-13x = 125, x = 125, x = 415, x = 9. A: the barrel of oil is originally 9kg