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Find the formula, not the equation 1. A bowl of rice, the first day was stolen by the mouse more than 1 / 5 of 16 kg, the next day was stolen by the mouse the remaining 1 / 3 less than 4 g, there are 260 g, the original bowl of rice how many grams? 2. A pile of apples to four people, a took 1 / 6 of them, B took the remaining 2 / 5, C took the remaining 3 / 4, D took the last 15, How many apples are there in this pile? 3. There are several tons in the coal yard. Half of them are transported in the first day, 450 tons are transported in the second day, and half and 50 tons are transported in the third day. As a result, there are 600 tons of coal left. How many tons of coal are there? The first mouse stole more than 1 / 5 of 16 grams, which was not a typo.
1、（260-4）÷（1-1/3）=384
(384 + 16) / (1-1 / 5) = 500g
2. 15 ± (1-3 / 4) ± (1-2 / 5) ± (1 / 6) = 600
3. The third day ago: (600 + 50) / (1 / 2) = 1300 tons
The next day, 1300-450 = 850 tons
The original 850 (1 / 2) = 1700 tons
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