Emma had $25.50. She bought 3 identical notebooks and had $7.80 left. How much did each notebook cost?

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Let's solve Emma's notebook problem step by step. Emma started with twenty-five dollars and fifty cents. She bought three identical notebooks and had seven dollars and eighty cents left over. We need to find out how much each notebook cost. Now let's solve this step by step. First, we need to find out how much Emma spent on the notebooks. We subtract the amount she had left from her initial amount. Twenty-five dollars and fifty cents minus seven dollars and eighty cents equals seventeen dollars and seventy cents. Now for step two. We need to find the cost of each notebook by dividing the total amount spent by the number of notebooks. Seventeen dollars and seventy cents divided by three equals five dollars and ninety cents. So each notebook costs five dollars and ninety cents. Let's verify our answer to make sure it's correct. If each notebook costs five dollars and ninety cents, then three notebooks would cost seventeen dollars and seventy cents. Adding the seven dollars and eighty cents Emma had left gives us twenty-five dollars and fifty cents, which matches her initial amount. Our answer is correct! To summarize what we learned: We solved this problem by first finding the total amount spent, then dividing by the number of notebooks. Each notebook costs five dollars and ninety cents. Remember to always verify your answer by checking if it matches the original problem conditions.