15. (3 points) Basket A and Basket B originally contained 54 and 63 eggs, respectively. To make the number of eggs in Basket A twice the number of eggs in Basket B, how many eggs should be moved from Basket B to Basket A? $\qquad$
15. (3 points) Basket A and Basket B originally contained 54 and 63 eggs, respectively. To make the number of eggs in Basket A twice the number of eggs in Basket B, 24 eggs should be moved from Basket B to Basket A.
【Analysis】Basket A and Basket B originally contained 54 and 63 eggs, respectively, for a total of $54+63=117$ eggs. To make the number of eggs in Basket A twice the number of eggs in Basket B, the total number of eggs in both baskets remains 117. According to the sum and multiple formula, the number of eggs in Basket B at that time is $117 \div(2+1)=39$ eggs. Therefore, the number of eggs that need to be moved from Basket B to Basket A is $63-39=24$ eggs.
【Solution】Solution: $54+63=117$ (eggs)
$$
\begin{array}{l}
117 \div(2+1) \\
=117 \div 3 \\
=39 \text { (eggs); }
\end{array}
$$
$$
63-39=24 \text { (eggs). }
$$

Answer: 24 eggs should be moved from Basket B to Basket A.
The answer is: 24.
【Comment】The key to this problem is that the total number of eggs in both baskets remains unchanged. According to the multiple relationship, use the sum and multiple formula to find the number of eggs in Basket B after the adjustment, and then proceed with further calculations.