肯尼花了3个小时粉刷3间卧室。他粉刷前两间卧室所用的时间相同。他粉刷第三间卧室比第一间多花了15分钟。他粉刷第三间卧室花了多少分钟？

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. Convert the total time taken into minutes.

$3 \text{ hours} = 3 \times 60 = 180 \text{ minutes}$

2. Find the total time if all three bedrooms took the same time as the first bedroom.

Since the third bedroom took $15$ minutes longer, we subtract this extra time from the total:
$180 - 15 = 165 \text{ minutes}$

3. Calculate the time taken for the first bedroom (1 unit).

$165 \div 3 = 55 \text{ minutes}$

4. Calculate the time taken for the third bedroom.

$55 + 15 = 70 \text{ minutes}$

答案

$70$

AI 分析，可能出错

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