1. The figure shows two similar cylinders. Their radii are r and 2r . If the volume of the smaller cylinder is 20 ,the volume of the larger cylinder is _________.
2. If Q exceeds P by 50% and R exceeds Q by 50% ,find P:R.
Maths
2008-08-11 9:14 pm
回答 (1)
2008-08-11 10:34 pm
✔ 最佳答案
1. Let the larger cylinder’s volume be x cm3( r )3/( 2r)3 = 20/x
r3/8r3 = 20/x
160r3 = xr3
x= 160
**3=cube
2.
Let P be x
Q:P = 1.5x:1x
because Q is 1.5 x
R:Q = 1.5(1.5x):1.5x
R:Q = 2.25x:1.5x
R:Q:P = 2.25:1.5:1
R:P = 2.25:1
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