Let's solve this step by step. We have 2 willow trees planted in a row. Between every two willow trees, we plant 3 peach trees. We need to find how many peach trees are planted in total.
Step 1: We need to count how many spaces exist between the willow trees. When we have 2 trees arranged in a row, there is exactly 1 space between them. This follows the formula: number of spaces equals number of trees minus 1. So 2 minus 1 equals 1 space.
Step 2: Now we calculate the total number of peach trees. We multiply the number of spaces by the number of peach trees planted in each space. We have 1 space, and in each space we plant 3 peach trees. So 1 times 3 equals 3 peach trees in total. This is our final answer.
Let's generalize this solution with a formula. For any tree planting problem, the number of spaces equals the number of trees minus 1. The total number of planted trees equals the number of spaces multiplied by the trees planted per space. In our specific case, we have 2 minus 1 equals 1 space, and 1 space times 3 peach trees per space equals 3 total peach trees.
Let's summarize our solution. We had 2 willow trees planted in a row, with 3 peach trees planted between each pair of willow trees. We calculated that there is 1 space between the 2 trees, and with 3 peach trees per space, we get a total of 3 peach trees. Therefore, the final answer is 3 peach trees.