biết 4,5 lít dầu cân nặng 3,42kg.hỏi 8 lít dầu cân nặng bao nhiêu kg?
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We can use the ratio method to solve this problem. The ratio of weight to volume is constant. So, if 4.5 liters of oil weighs 3.42 kg, then the ratio is 3.42 kg / 4.5 liters. Now, we can use this ratio to find the weight of 8 liters of oil. 8 liters * (3.42 kg / 4.5 liters) = 6.08 kg.

To find the weight of 8 liters of oil, we can use the concept of unitary method. We know that 4.5 liters of oil weighs 3.42 kg. So, 1 liter of oil weighs 3.42 kg / 4.5 liters = 0.76 kg. Therefore, 8 liters of oil would weigh 8 liters * 0.76 kg/liter = 6.08 kg.

We can set up a proportion to solve this problem. If 4.5 liters of oil weighs 3.42 kg, then 1 liter of oil weighs 3.42 kg / 4.5 liters = 0.76 kg. Now, we can set up the proportion: 4.5 liters is to 3.42 kg as 8 liters is to x kg. Cross-multiplying, we get 4.5 * x = 8 * 0.76. Solving for x, we find that 8 liters of oil weighs x = (8 * 0.76) / 4.5 = 1.35 kg.

The ratio between the weight and the volume of oil is constant. So, if 4.5 liters of oil weighs 3.42 kg, then 1 liter of oil weighs 3.42 kg / 4.5 liters = 0.76 kg. Therefore, 8 liters of oil would weigh 8 liters * 0.76 kg/liter = 6.08 kg.