Problem Solving
试题详情
题目：
In a small snack shop, the average (arithmetic mean) revenue was $400 per day over a 10-day period. During this period, if the average daily revenue was $360 for the first 6 days, what was the average daily revenue for the last 4 days?
选项:
A、$420$440
B、$450
C、$460
D、$480
答案:
D
提问：
20日后准备三战，2战600出头
初步计划这20天用3天巩固数学、作文
剩下时间通过做GWD和pp，挑出错题后纠正自己思维模式
最后3天看看jj和模考。
请英老师指点下。
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