Question

Alice 需要更换厨房里一个位于天花板下方 $10$ 厘米处的灯泡。天花板离地面 $2.4$ 米。Alice 身高 $1.5$ 米，并且手能伸到头顶上方 $46$ 厘米。站在凳子上时，她刚好能够到灯泡。凳子的高度是多少厘米？

Alice needs to replace a light bulb located $10$ centimeters below the ceiling in her kitchen. The ceiling is $2.4$ meters above the floor. Alice is $1.5$ meters tall and can reach $46$ centimeters above the top of her head. Standing on a stool, she can just reach the light bulb. What is the height of the stool, in centimeters?

$\ 32$

$\ 34$

$\ 36$

$\ 38$

$\ 40$

答案：B

知识点：单位换算

难度评级：770

解答：

天花板高度为 $2.4 \cdot 100 = 240$ 厘米。减去已知的各段高度，得到因此凳子的高度是三十四厘米。所以正确答案是 B。 $240 - 150 - 46 - 10 = 34.$

We know the height of the ceiling is $2.4 \cdot 100 = 240$ cm. Subtracting out all the given values, we get $240 - 150 - 46 - 10 = 34.$ Therefore, the height of the stool is 34 cm. Thus, B is the correct answer.

2010 AMC 8 第 5 题

答案：B

难度评级：770

解答：

其他年份的第 5 题