The actual coal consumption of the sixth grade math problem is 7 / 9 of the original planned coal consumption

[original plan] coal consumption x9-7 = [actual] coal consumption

If you pour 5 / 7 kg from barrel a to barrel B, which barrel has more oil? How many kg

Yiduo 5 / 7x2-1 = 3 / 7kg
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The total weight of a and B barrels is 240kg. Pour 25% of a barrel into B barrel, and the weight of the two barrels is equal. The original two barrels each weigh several thousand grams

Suppose there is x kg of oil in the barrel
25%*x+240-x=(1-25%)*x
1.5x=240
x=160
So there are 160kg and 80kg for each barrel

The total weight of the two barrels of oil a and B is 5.1kg. Three fourths of the oil a is equal to two thirds of the oil B. how many kg are the two barrels of oil

The ratio of a and B is 2 / 3:3 / 4 = 8:9
Weight of nail: 5.1 ÷ (8 + 9) X8 = 2.4 (kg)
Weight of B: 5.1-2.4 = 2.7 (kg)

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