在一次游戏中，荣顺（Eng Soon）、福兹（Fauzi）和哈里什（Harish）的平均得分是 68.5 分。加里（Gary）加入游戏后，这四个孩子的平均得分变成了 70 分。

它不会直接告诉你答案，而是问你卡在哪一步看看 AI 是怎么陪你一步步弄懂这道题的

完整解法

1. Calculate the total score of the first three children

Total score of 3 children = $68.5 \times 3 = 205.5$

2. Calculate the total score of all four children

Total score of 4 children = $70 \times 4 = 280$

3. Find Gary's score by subtracting the total of the first three from the total of all four

Gary's score = $280 - 205.5 = 74.5$

答案

$74.5$

1. Find the total score of the four children

Total score $= 4 \times 70 = 280$

2. Find Gary's score (from part a)

Total score of 3 children $= 3 \times 68.5 = 205.5$
Gary's score $= 280 - 205.5 = 74.5$

3. Calculate the percentage of the total score that Gary scored

Percentage $= \frac{74.5}{280} \times 100\% \approx 26.607\%$

4. Round the percentage to the nearest whole number

$26.607\% \approx 27\%$

答案

$27\%$

AI 分析，可能出错

用 AI 批改，圈出写错的那一步，并自动将你的薄弱点存入错题本，形成你的错因库。