The second basket: 42+ 12 = 54

The first basket: 54+9 * 2 = 72

Explanation: Because "if you take nine apples from the first basket and put them in the second basket, the number of apples in the two baskets is equal." It can be seen that the first basket is 9 * 2 = 18 more than the second basket.

Because "if you take 12 apples from the second basket and put them in the first basket, the number of apples in the first basket is equal to twice that of the second basket", you can know that if the first basket increases 12 and the second basket decreases 12, there will be 24 more apples than the second basket, plus the original/ Then the first basket is twice as big as the second basket, and the second basket is only 42.

It turns out that the second basket should be based on this 42+12, which means 42+ 12 = 54.

The first basket is more than the second basket 18, which means 54+9 * 2 = 72.