A pile of coal was burnt out in two days. Two fifths of the coal was burnt in the first day, and two fifths of the coal was burnt in the second day. How much more was burnt in that day?

A pile of coal was burnt out in two days. Two fifths of the coal was burnt in the first day, and two fifths of the coal was burnt in the second day. How much more was burnt in that day?

The next day 1-2 / 5 = 3 / 5 of the total
More than the next day
2 / 5 - (2 / 5 △ 3 / 5) 2 / 5 = 2 / 15 tons

A pile of coal will be transported in three days. Two fifths of the coal will be transported in the first day and 55 tons in the second day. The ratio of the coal transported in the third day to the sum of the coal transported in the first and second days is 2:5,
Day one

2 / (2 + 5) = 2 / 7 of the third day's luck
1-2 / 5-2 / 7 of the next day's luck = 11 / 35
Total weight 55 △ 11 / 35 = 175 tons
175 × 2 / 5 = 70 tons on the first day