Solving practical problems with reduction method in primary school For a basket of apples, a takes out 1 / 3 of them and then takes out 1 / 3, B takes out the remaining 1 / 3 and then takes out 1 / 3, C and d take them according to the above method. At this time, there are still 15 apples in the basket. How many are there in the basket? Specific algorithm Speed~~~

Solving practical problems with reduction method in primary school For a basket of apples, a takes out 1 / 3 of them and then takes out 1 / 3, B takes out the remaining 1 / 3 and then takes out 1 / 3, C and d take them according to the above method. At this time, there are still 15 apples in the basket. How many are there in the basket? Specific algorithm Speed~~~

(15 + 1 / 3) / (1-1 / 3) = 23
(23 + 1 / 3) / (1-1 / 3) = 35
(35 + 1 / 3) / (1-1 / 3) = 53
(53 + 1 / 3) / (1-1 / 3) = 80

Solving practical problems by reduction method
1. One third of a bottle of wine is poured out for the first time, then 40 grams is poured back, the remaining 9 / 5 is poured out for the second time, and the remaining 60 grams is poured out for the third time. How many grams of wine are there?
2. For a basket of apples, take out more than half and two apples at the first time, take out more than half and two apples at the second time, and take out eight apples at the third time. There are still two apples left in the basket. How many apples are there?
3. To build a highway, the first day we built more than 2 kilometers of the total length, the second day we built the remaining 2 kilometers less than 1 kilometers, and there are still 20 kilometers left. How many kilometers is the total length of this highway?

1. Let (1-1 / 3) x + 40 be the first residue of the original x gram, the second residue of (1-5 / 9) [(1-1 / 3) x + 40] be the third residue of (1-5 / 9) [(1-1 / 3) x + 40] - 180 = 60x = 7502, and let (1-1 / 2) X-2 be the second residue of (1-1 / 2) [(1-1 / 2) X-2] - 2 be the third residue of (1-1 / 2)