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A pile of coal, the first day to use one fifth, the second day to use two fifths of tons, just used up, this pile of coal a total of how many tons
After using one fifth, there are four fifths left. Four fifths is just two fifths of a ton
2 / 5 (4 / 5) = 1 / 2 ton
A ton of coal weighs 120 tons, and a car has transported 1 / 3 of it four times. At this speed, how many times can it be transported completely
12
There are 40 tons of coal in a pile. Two fifths of the coal will be transported in the first day. Three fourths of the coal will be transported in the second day. How many tons are left?
On the first day, 40 * 2 / 5 = 16 tons were transported
The next day, 16 * 3 / 4 = 12 tons were transported
The remaining 40-16-12 = 12 tons
If you don't understand,
For a batch of 40 tons of goods, two fifths of them were transported in the first batch, and three fourths of them were transported in the second batch?
There are two algorithms
1.1-2/5-2/5*3/4=3/10
2. The first shipment 40 * 2 / 5 = 16
The second transport 16 * 3 / 4 = 12
The remaining 40-16-12 = 12
12 / 40 of the remaining total = 0.3
I hope it will help you
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