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A barrel of oil weighs 15 kg, which is 2 kg more than two fifths of the whole barrel for the first time? Hurry! Hurry! Hurry!
15*(1-2/5)-2=7
A barrel of oil is 45 kg. Two fifths of it is used. How much is left
45x3 / 5 = 27kg
A barrel of oil weighs 8kg. After three fifths of the oil is poured out, the barrel weighs 3.5kg. How many kilograms does the barrel weigh? Why?
Oil weight (8-3.5) △ 3 / 5 = 4.5 △ 3 / 5 = 7.5kg
Barrel weight 8-7.5 = 0.5kg
A barrel of oil weighs 56 kg, and 13% of the oil is poured. At this time, the weight of the remaining oil is four times that of the barrel. How many kg is the original oil weight?
Suppose that the original weight of oil is XKG, then the barrel weight is 56-xkg, and the following equation can be obtained: & nbsp; (1-13) x = 4 × (56-x) & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; 23x = 224-4x + 4x, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; 423x = 224, & nbsp; 143x △ 143 = 224 △ 143, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; X = 48; a: the original weight of oil is 48kg
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